Avoid index-out-of-bounds in processDrcTime

Fixes: 17638/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LIBFDK_AAC_fuzzer-5699860921057280 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
mstorsjo · Oct 2, 2019 · f3f3b69 · f3f3b69
1 parent e3bc3e4
commit f3f3b69
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/libDRCdec/src/drcGainDec_process.cpp b/libDRCdec/src/drcGainDec_process.cpp
@@ -308,6 +308,8 @@ processDrcTime(HANDLE_DRC_GAIN_DECODER hGainDec, const int activeDrcIndex,
               pLinearNodeBuffer[pActiveDrc->lnbIndexForChannel[c][lnbIx] + b]);
         else
           pLnbPrevious = pDummyLnb;
+        if (pLnbPrevious->nNodes[lnbIx] <= 0 || pLnbPrevious->nNodes[lnbIx] > 16)
+          return DE_NOT_OK;
         nodePrevious =
             pLnbPrevious->linearNode[lnbIx][pLnbPrevious->nNodes[lnbIx] - 1];
         nodePrevious.time -= hGainDec->frameSize;