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avcodec/mpeg4videodec: Clear mcsel before decoding an image

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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@niedermayer.cc>
(cherry picked from commit 7735ed29741d985e1e670249ca56e7a1ce18b729)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-08-06 13:32:54 +02:00
parent 55fe7a738f
commit a5c83b586b
1 changed files with 1 additions and 0 deletions
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libavcodec/mpeg4videodec.c
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@ -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)) {