avformat/siff: Reject audio packets without audio stream

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 <[email protected]> Signed-off-by: Michael Niedermayer <[email protected]>
lgeek · Aug 20, 2020 · 8931c55 · 8931c55
1 parent 36f7b83
commit 8931c55
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/libavformat/siff.c b/libavformat/siff.c
@@ -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);