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extra checking on memory allocation sizes to prevent a class of overflow attacks

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This commit is contained in:
Josh Coalson
2007-09-11 04:49:56 +00:00
parent 0221d87c89
commit 0f008d2e9e
26 changed files with 234 additions and 115 deletions
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3
src/libFLAC/bitwriter.c
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@@ -50,6 +50,7 @@
#include "private/bitwriter.h"
#include "private/crc.h"
#include "FLAC/assert.h"
#include "share/alloc.h"
/* Things should be fastest when this matches the machine word size */
/* WATCHOUT: if you change this you must also change the following #defines down to SWAP_BE_WORD_TO_HOST below to match */
@@ -141,7 +142,7 @@ static FLAC__bool bitwriter_grow_(FLAC__BitWriter *bw, unsigned bits_to_add)
FLAC__ASSERT(new_capacity > bw->capacity);
FLAC__ASSERT(new_capacity >= bw->words + ((bw->bits + bits_to_add + FLAC__BITS_PER_WORD - 1) / FLAC__BITS_PER_WORD));
new_buffer = (bwword*)realloc(bw->buffer, sizeof(bwword)*new_capacity);
new_buffer = (bwword*)safe_realloc_mul_2op_(bw->buffer, sizeof(bwword), /*times*/new_capacity);
if(new_buffer == 0)
return false;
bw->buffer = new_buffer;