avcodec/h264_cavlc: Fix undefined behavior on qscale overflow

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>
8 years ago · fc8cff96ed
parent 207e6debf8
commit fc8cff96ed
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/h264_cavlc.c
+++ b/libavcodec/h264_cavlc.c
@ -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;