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| author | Michael Niedermayer <michaelni@gmx.at> | 2013-01-24 02:51:12 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2013-01-24 02:51:51 +0100 |
| commit | 69fb605ad5e0f1384ca4d06d38ce0f1b6c8c286d (patch) | |
| tree | 346c69d1547d06f57c864c3dca0181e4496ca7c2 /libavformat/mpc8.c | |
| parent | ee9151b616fa7fa5e9b3258ecafd00c9f784baaa (diff) | |
mpc8: check stream count before accessing stream 1.
Fixes null pointer dereference
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavformat/mpc8.c')
| -rw-r--r-- | libavformat/mpc8.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c index 011c7c8e64..73f805711d 100644 --- a/libavformat/mpc8.c +++ b/libavformat/mpc8.c @@ -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){ |