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avcodec/vb: Check input packet size to be large enough to contain flags 

Fixes: Timeout (->9sec)
Fixes: 16292/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VB_fuzzer-5747063496638464

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 dea2591d4f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-12 00:21:49 +02:00
parent f4431b6b0c
commit db421282be
1 changed files with 3 additions and 0 deletions
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libavcodec/vb.c
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@ -199,6 +199,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
uint32_t size; uint32_t size;
int offset = 0; int offset = 0;
if (avpkt->size < 2)
return AVERROR_INVALIDDATA;
bytestream2_init(&c->stream, avpkt->data, avpkt->size); bytestream2_init(&c->stream, avpkt->data, avpkt->size);
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)