[FFmpeg-cvslog] avformat/lvfdec: Check stream_index before use
Michael Niedermayer
git at videolan.org
Tue Nov 10 18:13:24 EET 2020
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Nov 8 00:17:09 2020 +0100| [b1d99ab14f2fd273e678dcb618dabfb38aab91b6] | committer: Michael Niedermayer
avformat/lvfdec: Check stream_index before use
Fixes: assertion failure
Fixes: 26905/clusterfuzz-testcase-minimized-ffmpeg_dem_LVF_fuzzer-5724267599364096.fuzz
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b1d99ab14f2fd273e678dcb618dabfb38aab91b6
---
libavformat/lvfdec.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/libavformat/lvfdec.c b/libavformat/lvfdec.c
index 8b8d6f01b9..4c87728def 100644
--- a/libavformat/lvfdec.c
+++ b/libavformat/lvfdec.c
@@ -106,6 +106,7 @@ static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt)
unsigned size, flags, timestamp, id;
int64_t pos;
int ret, is_video = 0;
+ int stream_index;
pos = avio_tell(s->pb);
while (!avio_feof(s->pb)) {
@@ -121,12 +122,15 @@ static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt)
case MKTAG('0', '1', 'w', 'b'):
if (size < 8)
return AVERROR_INVALIDDATA;
+ stream_index = is_video ? 0 : 1;
+ if (stream_index >= s->nb_streams)
+ return AVERROR_INVALIDDATA;
timestamp = avio_rl32(s->pb);
flags = avio_rl32(s->pb);
ret = av_get_packet(s->pb, pkt, size - 8);
if (flags & (1 << 12))
pkt->flags |= AV_PKT_FLAG_KEY;
- pkt->stream_index = is_video ? 0 : 1;
+ pkt->stream_index = stream_index;
pkt->pts = timestamp;
pkt->pos = pos;
return ret;
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