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REVIEWED: CompressData(), possible stack overflow

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`struct sdefl` is almost 1MB, in some platforms it could generated a stack overflow, for example WebAssembly, where by default stack is only 65KB!
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Ray
2023-09-20 21:23:43 +02:00
parent 36e99860ee
commit a2b3b1ebe4
1 changed files with 6 additions and 4 deletions
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8
src/rcore.c
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@@ -3589,10 +3589,12 @@ unsigned char *CompressData(const unsigned char *data, int dataSize, int *compDa
#if defined(SUPPORT_COMPRESSION_API)
// Compress data and generate a valid DEFLATE stream
struct sdefl sdefl = { 0 };
int bounds = sdefl_bound(dataSize);
struct sdefl *sdefl = RL_CALLOC(1, sizeof(struct sdefl)); // WARNING: Possible stack overflow, struct sdefl is almost 1MB
int bounds = dataSize*2;//sdefl_bound(dataSize);
compData = (unsigned char *)RL_CALLOC(bounds, 1);
*compDataSize = sdeflate(&sdefl, compData, data, dataSize, COMPRESSION_QUALITY_DEFLATE); // Compression level 8, same as stbiw
*compDataSize = sdeflate(sdefl, compData, data, dataSize, COMPRESSION_QUALITY_DEFLATE); // Compression level 8, same as stbiw
RL_FREE(sdefl);
TRACELOG(LOG_INFO, "SYSTEM: Compress data: Original size: %i -> Comp. size: %i", dataSize, *compDataSize);
#endif