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Disallow Too-Long Repcodes When Using an Attached Dict

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This commit is contained in:
W. Felix Handte
2018-06-13 14:58:36 -04:00
parent c14db94450
commit f74c2cd673
1 changed files with 20 additions and 2 deletions
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lib/compress/zstd_lazy.c
+20 -2
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@@ -503,15 +503,33 @@ size_t ZSTD_compressBlock_lazy_generic(
(searchMethod ? ZSTD_BtFindBestMatch_selectMLS : ZSTD_HcFindBestMatch_selectMLS);
U32 offset_1 = rep[0], offset_2 = rep[1], savedOffset=0;
const ZSTD_matchState_t* const dms = ms->dictMatchState;
const U32 dictLowestIndex = dictMode == ZSTD_dictMatchState ?
dms->window.dictLimit : 0;
const BYTE* const dictBase = dictMode == ZSTD_dictMatchState ?
dms->window.base : NULL;
const BYTE* const dictLowest = dictMode == ZSTD_dictMatchState ?
dictBase + dictLowestIndex : NULL;
const BYTE* const dictEnd = dictMode == ZSTD_dictMatchState ?
dms->window.nextSrc : NULL;
const U32 dictAndPrefixLength = (U32)(ip - prefixLowest + dictEnd - dictLowest);
(void)dictMode;
/* init */
ip += (ip==prefixLowest);
ip += (dictAndPrefixLength == 0);
ms->nextToUpdate3 = ms->nextToUpdate;
{ U32 const maxRep = (U32)(ip-prefixLowest);
if (dictMode == ZSTD_noDict) {
U32 const maxRep = (U32)(ip - prefixLowest);
if (offset_2 > maxRep) savedOffset = offset_2, offset_2 = 0;
if (offset_1 > maxRep) savedOffset = offset_1, offset_1 = 0;
}
if (dictMode == ZSTD_dictMatchState) {
/* dictMatchState repCode checks don't currently handle repCode == 0
* disabling. */
assert(offset_1 <= dictAndPrefixLength);
assert(offset_2 <= dictAndPrefixLength);
}
/* Match Loop */
while (ip < ilimit) {