Avoid Undefined Behavior in Match Ptr Calculation

2018-05-23 17:53:03 -04:00
parent a44ab3b475
commit 9c92223468
1 changed files with 3 additions and 3 deletions
@@ -99,10 +99,10 @@ size_t ZSTD_compressBlock_fast_generic(
        U32 const matchIndex = hashTable[h];
        const BYTE* match = base + matchIndex;
        const U32 repIndex = current + 1 - offset_1;
-        const BYTE* repBase = (dictMode == ZSTD_dictMatchState
+        const BYTE* repMatch = (dictMode == ZSTD_dictMatchState
                            && repIndex < prefixLowestIndex) ?
-                               dictBase - dictIndexDelta : base;
-        const BYTE* repMatch = repBase + repIndex;
+                               dictBase + (repIndex - dictIndexDelta) :
+                               base + repIndex;
        hashTable[h] = current;   /* update hash table */

        if (dictMode == ZSTD_dictMatchState