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matroska: Clear prev_pkt between seeks.

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The new incremental parser doesn't always clear prev_pkt,
however the packet queue is cleared when seeking. Which leads
to a use-after-free.

Verified using Valgrind.

Signed-off-by: Dale Curtis <dalecurtis@chromium.org>
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
This commit is contained in:
Dale Curtis 2012-04-23 16:15:31 +00:00 committed by Justin Ruggles
parent 83b26046fc
commit 7521c4bab2
1 changed files with 1 additions and 0 deletions
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libavformat/matroskadec.c
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@ -2094,6 +2094,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
avio_seek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
matroska->current_id = 0;
while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
matroska->prev_pkt = NULL;
matroska_clear_queue(matroska);
if (matroska_parse_cluster(matroska) < 0)
break;