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avformat/matroskadec: Check subtitle stream before dereferencing
Unrecognized streams are not allocated
Fixes: flicker-1.color1.vp91447030769.08.webm
Found-by: Chris Cunningham <chcunningham@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a5034b324c
)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -3055,6 +3055,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
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tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
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tracks[i].end_timecode = 0;
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if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
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tracks[i].stream &&
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tracks[i].stream->discard != AVDISCARD_ALL) {
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index_sub = av_index_search_timestamp(
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tracks[i].stream, st->index_entries[index].timestamp,
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