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fuzzer: added tests to detect LZ4_decompress_fast() out of bound read

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This commit is contained in:
Yann Collet 2019-04-17 13:31:24 -07:00
parent b59fd652e8
commit 1ed69691a1
1 changed files with 28 additions and 20 deletions
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18
tests/fuzzer.c
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@ -481,32 +481,40 @@ static int FUZ_test(U32 seed, U32 nbCycles, const U32 startCycle, const double c
/* Test compression */
FUZ_DISPLAYTEST("test LZ4_compress_default()");
ret = LZ4_compress_default(block, compressedBuffer, blockSize, (int)compressedBufferSize);
FUZ_CHECKTEST(ret==0, "LZ4_compress_default() failed");
FUZ_CHECKTEST(ret<=0, "LZ4_compress_default() failed");
compressedSize = ret;
/* Decompression tests */
/* Test decompress_fast() with input buffer size exactly correct => must not read out of bound */
{ char* const cBuffer_exact = malloc((size_t)compressedSize);
assert(cBuffer_exact != NULL);
memcpy(cBuffer_exact, compressedBuffer, compressedSize);
/* Test decoding with output size exactly correct => must work */
FUZ_DISPLAYTEST("LZ4_decompress_fast() with exact output buffer");
ret = LZ4_decompress_fast(compressedBuffer, decodedBuffer, blockSize);
ret = LZ4_decompress_fast(cBuffer_exact, decodedBuffer, blockSize);
FUZ_CHECKTEST(ret<0, "LZ4_decompress_fast failed despite correct space");
FUZ_CHECKTEST(ret!=compressedSize, "LZ4_decompress_fast failed : did not fully read compressed data");
{ U32 const crcCheck = XXH32(decodedBuffer, blockSize, 0);
{ U32 const crcCheck = XXH32(decodedBuffer, (size_t)blockSize, 0);
FUZ_CHECKTEST(crcCheck!=crcOrig, "LZ4_decompress_fast corrupted decoded data");
}
/* Test decoding with one byte missing => must fail */
FUZ_DISPLAYTEST("LZ4_decompress_fast() with output buffer 1-byte too short");
decodedBuffer[blockSize-1] = 0;
ret = LZ4_decompress_fast(compressedBuffer, decodedBuffer, blockSize-1);
ret = LZ4_decompress_fast(cBuffer_exact, decodedBuffer, blockSize-1);
FUZ_CHECKTEST(ret>=0, "LZ4_decompress_fast should have failed, due to Output Size being too small");
FUZ_CHECKTEST(decodedBuffer[blockSize-1], "LZ4_decompress_fast overrun specified output buffer");
/* Test decoding with one byte too much => must fail */
FUZ_DISPLAYTEST();
ret = LZ4_decompress_fast(compressedBuffer, decodedBuffer, blockSize+1);
ret = LZ4_decompress_fast(cBuffer_exact, decodedBuffer, blockSize+1);
FUZ_CHECKTEST(ret>=0, "LZ4_decompress_fast should have failed, due to Output Size being too large");
free(cBuffer_exact);
}
/* Test decoding with empty input */
FUZ_DISPLAYTEST("LZ4_decompress_safe() with empty input");
LZ4_decompress_safe(compressedBuffer, decodedBuffer, 0, blockSize);