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adding oversized check on decompression

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This commit is contained in:
Bimba Shrestha
2020-04-03 13:25:32 -07:00
parent 05574ec141
commit 936aa63ff1
1 changed files with 24 additions and 1 deletions
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lib/decompress/zstd_decompress.c
+24 -1
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@@ -1508,6 +1508,24 @@ MEM_STATIC size_t ZSTD_limitCopy(void* dst, size_t dstCapacity, const void* src,
return length;
}
static int ZSTD_isOversized(ZSTD_DStream* zds)
{
size_t const neededInBuffSize = MAX(zds->fParams.blockSizeMax, 4 /* frame checksum */);
size_t const neededOutBuffSize = ZSTD_decodingBufferSize_min(zds->fParams.windowSize, zds->fParams.frameContentSize);
int const inOversized = zds->inBuffSize >= neededInBuffSize * ZSTD_OVERSIZED_FACTOR;
int const outOversized = zds->outBuffSize >= neededOutBuffSize * ZSTD_OVERSIZED_FACTOR;
return inOversized || outOversized;
}
static void ZSTD_updateOversizedDuration(ZSTD_DStream* zds)
{
zds->oversizedDuration += ZSTD_isOversized(zds) != 0;
}
static int ZSTD_isOversizedTooLong(ZSTD_DStream* zds)
{
return zds->oversizedDuration >= ZSTD_OVERSIZED_MAXDURATION;
}
size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
{
@@ -1634,10 +1652,15 @@ size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inB
RETURN_ERROR_IF(zds->fParams.windowSize > zds->maxWindowSize,
frameParameter_windowTooLarge);
ZSTD_updateOversizedDuration(zds);
/* Adapt buffer sizes to frame header instructions */
{ size_t const neededInBuffSize = MAX(zds->fParams.blockSizeMax, 4 /* frame checksum */);
size_t const neededOutBuffSize = ZSTD_decodingBufferSize_min(zds->fParams.windowSize, zds->fParams.frameContentSize);
if ((zds->inBuffSize < neededInBuffSize) || (zds->outBuffSize < neededOutBuffSize)) {
int const tooSmall = (zds->inBuffSize < neededInBuffSize) || (zds->outBuffSize < neededOutBuffSize);
int const tooLarge = ZSTD_isOversizedTooLong(zds);
if (tooSmall || tooLarge) {
size_t const bufferSize = neededInBuffSize + neededOutBuffSize;
DEBUGLOG(4, "inBuff : from %u to %u",
(U32)zds->inBuffSize, (U32)neededInBuffSize);