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avcodec/h264_cavlc: Fix undefined behavior on qscale overflow

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Fixes: 1214/clusterfuzz-testcase-minimized-6130606599569408

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit fc8cff96ed)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-04-22 21:59:29 +02:00
parent 44eabc5d5d
commit 927ff67ab4
1 changed files with 1 additions and 1 deletions
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2
libavcodec/h264_cavlc.c
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@ -1112,7 +1112,7 @@ decode_intra_mb:
dquant= get_se_golomb(&sl->gb);
sl->qscale += dquant;
sl->qscale += (unsigned)dquant;
if (((unsigned)sl->qscale) > max_qp){
if (sl->qscale < 0) sl->qscale += max_qp + 1;