diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2012-04-22 15:56:07 +0400 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2012-04-22 16:58:28 +0400 |
| commit | abec6549ae1e86fdf89dbab8a8abca8eb7205c6e (patch) | |
| tree | 070a49406660c9de90e7532754816db13802cc01 /libavcodec/ffv1.c | |
| parent | 23a6e4749fa7134ce411ce186062f70f9d348603 (diff) | |
ffv1dec: Require a valid keyframe for decoding non keyframes.
Before this the context could become inconsistent, this lead to a null ptr
dereference.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/ffv1.c')
| -rw-r--r-- | libavcodec/ffv1.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libavcodec/ffv1.c b/libavcodec/ffv1.c index 491b3f5d32..ac37216c7d 100644 --- a/libavcodec/ffv1.c +++ b/libavcodec/ffv1.c @@ -193,6 +193,7 @@ typedef struct FFV1Context{ int gob_count; int packed_at_lsb; int ec; + int key_frame_ok; int quant_table_count; @@ -1945,11 +1946,17 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac p->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P if(get_rac(c, &keystate)){ p->key_frame= 1; + f->key_frame_ok = 0; if(read_header(f) < 0) return -1; if(init_slices_state(f) < 0) return -1; + f->key_frame_ok = 1; }else{ + if (!f->key_frame_ok) { + av_log(avctx, AV_LOG_ERROR, "Cant decode non keyframe without valid keyframe\n"); + return AVERROR_INVALIDDATA; + } p->key_frame= 0; } if(f->ac>1){ |