fixed invalid invocation of dictionary in legacy decoder v0.5

diff --git a/lib/legacy/zstd_v05.c b/lib/legacy/zstd_v05.c
index 96ffceb97149317ec8ae79ae8eb070baa640fea5..7e06901746b83917b4303adb5e8e9b1a0f1863e0 100644 (file)
--- a/lib/legacy/zstd_v05.c
+++ b/lib/legacy/zstd_v05.c
@@ -3063,7 +3063,7 @@ size_t ZSTDv05_decodeLiteralsBlock(ZSTDv05_DCtx* dctx,
 
 size_t ZSTDv05_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumpsLengthPtr,
                          FSEv05_DTable* DTableLL, FSEv05_DTable* DTableML, FSEv05_DTable* DTableOffb,
-                         const void* src, size_t srcSize)
+                         const void* src, size_t srcSize, U32 flagStaticTable)
 {
     const BYTE* const istart = (const BYTE* const)src;
     const BYTE* ip = istart;
@@ -3118,6 +3118,7 @@ size_t ZSTDv05_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumps
             FSEv05_buildDTable_raw(DTableLL, LLbits);
             break;
         case FSEv05_ENCODING_STATIC:
+            if (!flagStaticTable) return ERROR(corruption_detected);
             break;
         case FSEv05_ENCODING_DYNAMIC :
         default :   /* impossible */
@@ -3141,6 +3142,7 @@ size_t ZSTDv05_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumps
             FSEv05_buildDTable_raw(DTableOffb, Offbits);
             break;
         case FSEv05_ENCODING_STATIC:
+            if (!flagStaticTable) return ERROR(corruption_detected);
             break;
         case FSEv05_ENCODING_DYNAMIC :
         default :   /* impossible */
@@ -3164,6 +3166,7 @@ size_t ZSTDv05_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumps
             FSEv05_buildDTable_raw(DTableML, MLbits);
             break;
         case FSEv05_ENCODING_STATIC:
+            if (!flagStaticTable) return ERROR(corruption_detected);
             break;
         case FSEv05_ENCODING_DYNAMIC :
         default :   /* impossible */
@@ -3376,7 +3379,7 @@ static size_t ZSTDv05_decompressSequences(
     /* Build Decoding Tables */
     errorCode = ZSTDv05_decodeSeqHeaders(&nbSeq, &dumps, &dumpsLength,
                                       DTableLL, DTableML, DTableOffb,
-                                      ip, seqSize);
+                                      ip, seqSize, dctx->flagStaticTables);
     if (ZSTDv05_isError(errorCode)) return errorCode;
     ip += errorCode;
 
@@ -3385,6 +3388,7 @@ static size_t ZSTDv05_decompressSequences(
         seq_t sequence;
         seqState_t seqState;
 
+        dctx->flagStaticTables = 1;
         memset(&sequence, 0, sizeof(sequence));
         sequence.offset = REPCODE_STARTVALUE;
         seqState.dumps = dumps;