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avformat/siff: Reject audio packets without audio stream

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Fixes: Assertion failure
Fixes: 24612/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6600899842277376.fuzz

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>
This commit is contained in:
Michael Niedermayer 2020-08-11 14:41:13 +02:00
parent 36f7b83568
commit 8931c55789
1 changed files with 2 additions and 0 deletions
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2
libavformat/siff.c
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@ -201,6 +201,8 @@ static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
if (c->curstrm == -1) {
c->pktsize = avio_rl32(s->pb) - 4;
c->flags = avio_rl16(s->pb);
if (c->flags & VB_HAS_AUDIO && !c->has_audio)
return AVERROR_INVALIDDATA;
c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
if (c->gmcsize)
avio_read(s->pb, c->gmc, c->gmcsize);