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check return value of matroska_find_track_by_num (fix a segfault)

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Originally committed as revision 12659 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2008-03-31 20:16:04 +00:00
parent 4477dedc4f
commit 2d1cb02588
1 changed files with 1 additions and 0 deletions
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libavformat/matroskadec.c
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@ -2355,6 +2355,7 @@ matroska_read_header (AVFormatContext *s,
for (i=0; i<matroska->num_indexes; i++) {
MatroskaDemuxIndex *idx = &matroska->index[i];
track = matroska_find_track_by_num(matroska, idx->track);
if (track < 0) continue;
stream = matroska->tracks[track]->stream_index;
if (stream >= 0 && stream < matroska->ctx->nb_streams)
av_add_index_entry(matroska->ctx->streams[stream],