[FFmpeg-cvslog] avcodec/mpeg4videodec: Clear mcsel before decoding an image

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Sun Aug  6 13:32:54 2017 +0200| [a5c83b586b8097948a9cbba8937f89245cad4274] | 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>
(cherry picked from commit 7735ed29741d985e1e670249ca56e7a1ce18b729)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a5c83b586b8097948a9cbba8937f89245cad4274
---

 libavcodec/mpeg4videodec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index 2e74a33758..d04286bc3d 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -2283,6 +2283,7 @@ 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)) {