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avformat/vividas: Check and require 1 video stream 

The decoder hardcodes that audio is stream_id = 1 so it does not
currently work with more or less than 1 video stream at st=0

Fixes: assertion failure
Fixes: 18602/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6259277199310848

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-11-05 21:52:41 +01:00
parent d82ab96e76
commit 3e5a528bbe
1 changed files with 4 additions and 2 deletions
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6
libavformat/vividas.c
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@ -311,8 +311,10 @@ static int track_header(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *
num_video = avio_r8(pb);
avio_seek(pb, off, SEEK_SET);
if (num_video != 1)
av_log(s, AV_LOG_WARNING, "number of video tracks %d is not 1\n", num_video);
if (num_video != 1) {
av_log(s, AV_LOG_ERROR, "number of video tracks %d is not 1\n", num_video);
return AVERROR_PATCHWELCOME;
}
for (i = 0; i < num_video; i++) {
AVStream *st = avformat_new_stream(s, NULL);