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annotate contrib/python-zstandard/c-ext/compressiondict.c @ 30830:08fa3a76a080

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zstd: prevent potential free() of uninitialized memory This is a cherry pick of an upstream fix. The free() of uninitialed memory could likely only occur if a malloc() inside zstd fails. The patched functions aren't currently used by Mercurial. But I don't like leaving footguns sitting around.
author Gregory Szorc <gregory.szorc@gmail.com>
date Tue, 17 Jan 2017 10:17:13 -0800
parents b54a2984cdd4
children c32454d69b85
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /**
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2 * Copyright (c) 2016-present, Gregory Szorc
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3 * All rights reserved.
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4 *
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5 * This software may be modified and distributed under the terms
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6 * of the BSD license. See the LICENSE file for details.
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7 */
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8
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9 #include "python-zstandard.h"
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10
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11 extern PyObject* ZstdError;
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12
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13 ZstdCompressionDict* train_dictionary(PyObject* self, PyObject* args, PyObject* kwargs) {
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14 static char *kwlist[] = { "dict_size", "samples", "parameters", NULL };
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15 size_t capacity;
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16 PyObject* samples;
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17 Py_ssize_t samplesLen;
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18 PyObject* parameters = NULL;
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19 ZDICT_params_t zparams;
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20 Py_ssize_t sampleIndex;
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21 Py_ssize_t sampleSize;
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22 PyObject* sampleItem;
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23 size_t zresult;
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24 void* sampleBuffer;
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25 void* sampleOffset;
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26 size_t samplesSize = 0;
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27 size_t* sampleSizes;
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28 void* dict;
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29 ZstdCompressionDict* result;
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30
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31 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "nO!|O!", kwlist,
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32 &capacity,
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33 &PyList_Type, &samples,
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34 (PyObject*)&DictParametersType, &parameters)) {
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35 return NULL;
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36 }
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37
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38 /* Validate parameters first since it is easiest. */
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39 zparams.selectivityLevel = 0;
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40 zparams.compressionLevel = 0;
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41 zparams.notificationLevel = 0;
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42 zparams.dictID = 0;
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43 zparams.reserved[0] = 0;
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44 zparams.reserved[1] = 0;
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45
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46 if (parameters) {
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47 /* TODO validate data ranges */
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48 zparams.selectivityLevel = PyLong_AsUnsignedLong(PyTuple_GetItem(parameters, 0));
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49 zparams.compressionLevel = PyLong_AsLong(PyTuple_GetItem(parameters, 1));
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50 zparams.notificationLevel = PyLong_AsUnsignedLong(PyTuple_GetItem(parameters, 2));
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51 zparams.dictID = PyLong_AsUnsignedLong(PyTuple_GetItem(parameters, 3));
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52 }
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53
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54 /* Figure out the size of the raw samples */
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55 samplesLen = PyList_Size(samples);
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56 for (sampleIndex = 0; sampleIndex < samplesLen; sampleIndex++) {
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57 sampleItem = PyList_GetItem(samples, sampleIndex);
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58 if (!PyBytes_Check(sampleItem)) {
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59 PyErr_SetString(PyExc_ValueError, "samples must be bytes");
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60 /* TODO probably need to perform DECREF here */
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61 return NULL;
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62 }
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63 samplesSize += PyBytes_GET_SIZE(sampleItem);
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64 }
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65
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66 /* Now that we know the total size of the raw simples, we can allocate
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67 a buffer for the raw data */
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68 sampleBuffer = PyMem_Malloc(samplesSize);
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69 if (!sampleBuffer) {
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70 PyErr_NoMemory();
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71 return NULL;
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72 }
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73 sampleSizes = PyMem_Malloc(samplesLen * sizeof(size_t));
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74 if (!sampleSizes) {
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75 PyMem_Free(sampleBuffer);
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76 PyErr_NoMemory();
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77 return NULL;
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78 }
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79
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80 sampleOffset = sampleBuffer;
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81 /* Now iterate again and assemble the samples in the buffer */
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82 for (sampleIndex = 0; sampleIndex < samplesLen; sampleIndex++) {
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83 sampleItem = PyList_GetItem(samples, sampleIndex);
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84 sampleSize = PyBytes_GET_SIZE(sampleItem);
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85 sampleSizes[sampleIndex] = sampleSize;
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86 memcpy(sampleOffset, PyBytes_AS_STRING(sampleItem), sampleSize);
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87 sampleOffset = (char*)sampleOffset + sampleSize;
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88 }
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89
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90 dict = PyMem_Malloc(capacity);
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91 if (!dict) {
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92 PyMem_Free(sampleSizes);
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93 PyMem_Free(sampleBuffer);
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94 PyErr_NoMemory();
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95 return NULL;
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96 }
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97
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98 zresult = ZDICT_trainFromBuffer_advanced(dict, capacity,
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99 sampleBuffer, sampleSizes, (unsigned int)samplesLen,
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100 zparams);
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101 if (ZDICT_isError(zresult)) {
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102 PyErr_Format(ZstdError, "Cannot train dict: %s", ZDICT_getErrorName(zresult));
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103 PyMem_Free(dict);
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104 PyMem_Free(sampleSizes);
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105 PyMem_Free(sampleBuffer);
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106 return NULL;
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107 }
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108
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109 result = PyObject_New(ZstdCompressionDict, &ZstdCompressionDictType);
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110 if (!result) {
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111 return NULL;
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112 }
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113
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114 result->dictData = dict;
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115 result->dictSize = zresult;
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116 return result;
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117 }
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118
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119
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120 PyDoc_STRVAR(ZstdCompressionDict__doc__,
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121 "ZstdCompressionDict(data) - Represents a computed compression dictionary\n"
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122 "\n"
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123 "This type holds the results of a computed Zstandard compression dictionary.\n"
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124 "Instances are obtained by calling ``train_dictionary()`` or by passing bytes\n"
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125 "obtained from another source into the constructor.\n"
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126 );
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127
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128 static int ZstdCompressionDict_init(ZstdCompressionDict* self, PyObject* args) {
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129 const char* source;
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130 Py_ssize_t sourceSize;
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131
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132 self->dictData = NULL;
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133 self->dictSize = 0;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
134
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
135 #if PY_MAJOR_VERSION >= 3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
136 if (!PyArg_ParseTuple(args, "y#", &source, &sourceSize)) {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
137 #else
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
138 if (!PyArg_ParseTuple(args, "s#", &source, &sourceSize)) {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
139 #endif
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
140 return -1;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
141 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
142
30822
b54a2984cdd4 zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30435
diff changeset
143 self->dictData = PyMem_Malloc(sourceSize);
30435
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
144 if (!self->dictData) {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
145 PyErr_NoMemory();
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
146 return -1;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
147 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
148
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
149 memcpy(self->dictData, source, sourceSize);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
150 self->dictSize = sourceSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
151
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
152 return 0;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
153 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
154
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
155 static void ZstdCompressionDict_dealloc(ZstdCompressionDict* self) {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
156 if (self->dictData) {
30822
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 30435
diff changeset
157 PyMem_Free(self->dictData);
30435
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
158 self->dictData = NULL;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
159 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
160
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
161 PyObject_Del(self);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
162 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
163
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
164 static PyObject* ZstdCompressionDict_dict_id(ZstdCompressionDict* self) {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
165 unsigned dictID = ZDICT_getDictID(self->dictData, self->dictSize);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
166
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
167 return PyLong_FromLong(dictID);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
168 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
169
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
170 static PyObject* ZstdCompressionDict_as_bytes(ZstdCompressionDict* self) {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
171 return PyBytes_FromStringAndSize(self->dictData, self->dictSize);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
172 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
173
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
174 static PyMethodDef ZstdCompressionDict_methods[] = {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
175 { "dict_id", (PyCFunction)ZstdCompressionDict_dict_id, METH_NOARGS,
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
176 PyDoc_STR("dict_id() -- obtain the numeric dictionary ID") },
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
177 { "as_bytes", (PyCFunction)ZstdCompressionDict_as_bytes, METH_NOARGS,
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
178 PyDoc_STR("as_bytes() -- obtain the raw bytes constituting the dictionary data") },
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
179 { NULL, NULL }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
180 };
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
181
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
182 static Py_ssize_t ZstdCompressionDict_length(ZstdCompressionDict* self) {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
183 return self->dictSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
184 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
185
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
186 static PySequenceMethods ZstdCompressionDict_sq = {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
187 (lenfunc)ZstdCompressionDict_length, /* sq_length */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
188 0, /* sq_concat */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
189 0, /* sq_repeat */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
190 0, /* sq_item */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
191 0, /* sq_ass_item */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
192 0, /* sq_contains */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
193 0, /* sq_inplace_concat */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
194 0 /* sq_inplace_repeat */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
195 };
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
196
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
197 PyTypeObject ZstdCompressionDictType = {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
198 PyVarObject_HEAD_INIT(NULL, 0)
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
199 "zstd.ZstdCompressionDict", /* tp_name */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
200 sizeof(ZstdCompressionDict), /* tp_basicsize */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
201 0, /* tp_itemsize */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
202 (destructor)ZstdCompressionDict_dealloc, /* tp_dealloc */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
203 0, /* tp_print */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
204 0, /* tp_getattr */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
205 0, /* tp_setattr */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
206 0, /* tp_compare */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
207 0, /* tp_repr */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
208 0, /* tp_as_number */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
209 &ZstdCompressionDict_sq, /* tp_as_sequence */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
210 0, /* tp_as_mapping */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
211 0, /* tp_hash */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
212 0, /* tp_call */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
213 0, /* tp_str */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
214 0, /* tp_getattro */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
215 0, /* tp_setattro */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
216 0, /* tp_as_buffer */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
217 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
218 ZstdCompressionDict__doc__, /* tp_doc */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
219 0, /* tp_traverse */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
220 0, /* tp_clear */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
221 0, /* tp_richcompare */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
222 0, /* tp_weaklistoffset */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
223 0, /* tp_iter */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
224 0, /* tp_iternext */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
225 ZstdCompressionDict_methods, /* tp_methods */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
226 0, /* tp_members */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
227 0, /* tp_getset */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
228 0, /* tp_base */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
229 0, /* tp_dict */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
230 0, /* tp_descr_get */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
231 0, /* tp_descr_set */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
232 0, /* tp_dictoffset */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
233 (initproc)ZstdCompressionDict_init, /* tp_init */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
234 0, /* tp_alloc */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
235 PyType_GenericNew, /* tp_new */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
236 };
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
237
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
238 void compressiondict_module_init(PyObject* mod) {
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
239 Py_TYPE(&ZstdCompressionDictType) = &PyType_Type;
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
240 if (PyType_Ready(&ZstdCompressionDictType) < 0) {
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
241 return;
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
242 }
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
243
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
244 Py_INCREF((PyObject*)&ZstdCompressionDictType);
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
245 PyModule_AddObject(mod, "ZstdCompressionDict",
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
246 (PyObject*)&ZstdCompressionDictType);
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
247 }