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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-06-14 19:51:23 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-05 01:47:56 +0200 |
| commit | 5fd3af45bc16cd7ca196d76b42765340ddf6d92e (patch) | |
| tree | 7394330af0d10830b95c1e8171790e627bfe8e1f | |
| parent | 19d9c4064708377b52489e444a44c6ba2242f850 (diff) | |
| download | ffmpeg-5fd3af45bc16cd7ca196d76b42765340ddf6d92e.tar.gz | |
avformat/4xm: Check that a video stream was created before returning packets for it
Fixes: assertion failure
Fixes: 23434/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5227750851084288.fuzz
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 c517c3f4741b6897ea952d1fba199c93c5217cfe)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/4xm.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libavformat/4xm.c b/libavformat/4xm.c index b6c5ecbb48..22c4b1b884 100644 --- a/libavformat/4xm.c +++ b/libavformat/4xm.c @@ -218,6 +218,7 @@ static int fourxm_read_header(AVFormatContext *s) fourxm->track_count = 0; fourxm->tracks = NULL; fourxm->fps = (AVRational){1,1}; + fourxm->video_stream_index = -1; /* skip the first 3 32-bit numbers */ avio_skip(pb, 12); @@ -323,6 +324,8 @@ static int fourxm_read_packet(AVFormatContext *s, case cfr2_TAG: /* allocate 8 more bytes than 'size' to account for fourcc * and size */ + if (fourxm->video_stream_index < 0) + return AVERROR_INVALIDDATA; if (size + 8 < size || av_new_packet(pkt, size + 8)) return AVERROR(EIO); pkt->stream_index = fourxm->video_stream_index; |