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Merge pull request #550 from iburinoc/matchoverlenwrite

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execSequence copies up to 2*WILDCOPY_OVERLENGTH extra
This commit is contained in:
Yann Collet
2017-02-16 18:14:47 -08:00
committed by GitHub
parent ff176d3208 0ed3901b05
commit f2da1b1f22
4 changed files with 16 additions and 8 deletions
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tests/zstreamtest.c
+13 -5
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@@ -469,15 +469,23 @@ static int basicUnitTests(U32 seed, double compressibility, ZSTD_customMem custo
/* Overlen overwriting window data bug */
DISPLAYLEVEL(3, "test%3i : wildcopy doesn't overwrite potential match data : ", testNb++);
{ const char* testCase =
"\x28\xB5\x2F\xFD\x04\x00\x4C\x00\x00\x10\x61\x61\x01\x00\xFC\x2A"
"\xC0\x02\x44\x00\x00\x08\x62\x01\x00\xFC\x2A\x10\x02\x00\x00\x00"
"\x4D\x00\x00\x00\x02\x40\x00\x01\x64\xE0\xE6\x19\xC1\xFB\x54\x9E";
{ /* This test has a window size of 1024 bytes and consists of 3 blocks:
1. 'a' repeated 517 times
2. 'b' repeated 516 times
3. a compressed block with no literals and 3 sequence commands:
litlength = 0, offset = 24, match length = 24
litlength = 0, offset = 24, match length = 3 (this one creates an overlength write of length 2*WILDCOPY_OVERLENGTH - 3)
litlength = 0, offset = 1021, match length = 3 (this one will try to read from overwritten data if the buffer is too small) */
const char* testCase =
"\x28\xB5\x2F\xFD\x04\x00\x4C\x00\x00\x10\x61\x61\x01\x00\x00\x2A"
"\x80\x05\x44\x00\x00\x08\x62\x01\x00\x00\x2A\x20\x04\x5D\x00\x00"
"\x00\x03\x40\x00\x00\x64\x60\x27\xB0\xE0\x0C\x67\x62\xCE\xE0";
ZSTD_DStream* zds = ZSTD_createDStream();
ZSTD_initDStream(zds);
inBuff.src = testCase;
inBuff.size = 48;
inBuff.size = 47;
inBuff.pos = 0;
outBuff.dst = decodedBuffer;
outBuff.size = CNBufferSize;