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| author | Michael Niedermayer <michaelni@gmx.at> | 2012-03-23 11:38:20 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2012-03-23 11:38:53 +0100 |
| commit | 2e909b3c77d0d39d4f30aba8b6a780c979551e38 (patch) | |
| tree | c4d76d57f236d91568bac647c1c32870e7d161f3 /libavcodec/bitstream.c | |
| parent | aae44fb4cdfab4fae4d981d2fe1fd708f1dcf9bb (diff) | |
bitstream: build_table, check table_nb_bits.
Fixes null ptr deref.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/bitstream.c')
| -rw-r--r-- | libavcodec/bitstream.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libavcodec/bitstream.c b/libavcodec/bitstream.c index aad5ffa2fb..506eb336a0 100644 --- a/libavcodec/bitstream.c +++ b/libavcodec/bitstream.c @@ -157,6 +157,8 @@ static int build_table(VLC *vlc, int table_nb_bits, int nb_codes, VLC_TYPE (*table)[2]; table_size = 1 << table_nb_bits; + if (table_nb_bits > 30) + return -1; table_index = alloc_table(vlc, table_size, flags & INIT_VLC_USE_NEW_STATIC); av_dlog(NULL, "new table index=%d size=%d\n", table_index, table_size); if (table_index < 0) |