From 75fa9c0b39f1eb3fe12c940dadd0b09d74b38042 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 17 Nov 2015 18:19:01 +0100 Subject: [PATCH] avformat/matroskadec: Check subtitle stream before dereferencing Unrecognized streams are not allocated Fixes: flicker-1.color1.vp91447030769.08.webm Found-by: Chris Cunningham Signed-off-by: Michael Niedermayer (cherry picked from commit a5034b324cad4c29d47ef285a30b0705e6eb0384) Signed-off-by: Michael Niedermayer --- libavformat/matroskadec.c | 1 + 1 file changed, 1 insertion(+) diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c index 2d64dc079f..9917b04876 100644 --- a/libavformat/matroskadec.c +++ b/libavformat/matroskadec.c @@ -2967,6 +2967,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index, tracks[i].audio.buf_timecode = AV_NOPTS_VALUE; tracks[i].end_timecode = 0; if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE && + tracks[i].stream && tracks[i].stream->discard != AVDISCARD_ALL) { index_sub = av_index_search_timestamp( tracks[i].stream, st->index_entries[index].timestamp,