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avcodec/fmvc: Check if header fields are available before allocating the image

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Fixes: Timeout (15sec -> 0.5sec)
Fixes: 14846/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FMVC_fuzzer-5068322120400896

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 561cc161ca)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-02 23:16:40 +02:00
parent 039c7d21f6
commit 30047c052d
1 changed files with 3 additions and 0 deletions
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3
libavcodec/fmvc.c
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@ -403,6 +403,9 @@ static int decode_frame(AVCodecContext *avctx,
AVFrame *frame = data;
int ret, y, x;
if (avpkt->size < 8)
return AVERROR_INVALIDDATA;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;