[FFmpeg-cvslog] avcodec/mpeg4videodec: Clear mcsel before decoding an image
Michael Niedermayer
git at videolan.org
Fri Aug 11 15:19:23 EEST 2017
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Aug 6 13:32:54 2017 +0200| [7735ed29741d985e1e670249ca56e7a1ce18b729] | committer: Michael Niedermayer
avcodec/mpeg4videodec: Clear mcsel before decoding an image
Fixes: runtime error: signed integer overflow: 2146467840 + 1032192 cannot be represented in type 'int'
Fixes: 2826/clusterfuzz-testcase-minimized-5901511613743104
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7735ed29741d985e1e670249ca56e7a1ce18b729
---
libavcodec/mpeg4videodec.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index 89c4b367f7..8f85e9362d 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -2290,6 +2290,7 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
int time_incr, time_increment;
int64_t pts;
+ s->mcsel = 0;
s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
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