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mpc8: check stream count before accessing stream 1.

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Fixes null pointer dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-01-24 02:51:12 +01:00
parent ee9151b616
commit 69fb605ad5
1 changed files with 5 additions and 0 deletions
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5
libavformat/mpc8.c
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@ -139,6 +139,11 @@ static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
int i, t, seekd;
GetBitContext gb;
if (s->nb_streams<=0) {
av_log(s, AV_LOG_ERROR, "cannot parse stream table before stream header\n");
return;
}
avio_seek(s->pb, off, SEEK_SET);
mpc8_get_chunk_header(s->pb, &tag, &size);
if(tag != TAG_SEEKTABLE){