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avcodec/pafvideo: Check packet size and frame code before ff_reget_buffer()

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Fixes 1745/clusterfuzz-testcase-minimized-6160693365571584
Fixes: Timeout

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 faa5a2181d)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-06-04 13:38:02 +02:00
parent 195b5b6cea
commit 6636b35ef0
1 changed files with 11 additions and 4 deletions
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15
libavcodec/pafvideo.c
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@ -267,12 +267,20 @@ static int paf_video_decode(AVCodecContext *avctx, void *data,
uint8_t code, *dst, *end;
int i, frame, ret;
if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
return ret;
if (pkt->size < 2)
return AVERROR_INVALIDDATA;
bytestream2_init(&c->gb, pkt->data, pkt->size);
code = bytestream2_get_byte(&c->gb);
if ((code & 0xF) > 4) {
avpriv_request_sample(avctx, "unknown/invalid code");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
return ret;
if (code & 0x20) { // frame is keyframe
for (i = 0; i < 4; i++)
memset(c->frame[i], 0, c->frame_size);
@ -367,8 +375,7 @@ static int paf_video_decode(AVCodecContext *avctx, void *data,
}
break;
default:
avpriv_request_sample(avctx, "unknown/invalid code");
return AVERROR_INVALIDDATA;
av_assert0(0);
}
av_image_copy_plane(c->pic->data[0], c->pic->linesize[0],