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avcodec/wcmv: check remaining space vs. blocks

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Fixes: Timeout (18sec  -> 7sec)
Fixes: 14835/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WCMV_fuzzer-5646714897170432

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-02 00:08:31 +02:00
parent d5a6b390ce
commit dd8720045c
1 changed files with 3 additions and 0 deletions
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3
libavcodec/wcmv.c
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@ -154,6 +154,9 @@ static int decode_frame(AVCodecContext *avctx,
bytestream2_seek(&gb, 2, SEEK_SET);
}
if (bytestream2_get_bytes_left(&gb) < 8LL * blocks)
return AVERROR_INVALIDDATA;
if (s->prev_frame->data[0]) {
ret = av_frame_copy(frame, s->prev_frame);
if (ret < 0)