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dxa: check reference frame availability before use. 

Fix 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 2012-11-30 20:58:26 +01:00
parent daede25f0b
commit 7205e896a1
1 changed files with 4 additions and 0 deletions
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4
libavcodec/dxa.c
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@ -270,6 +270,10 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
case 13:
c->pic.key_frame = 0;
c->pic.pict_type = AV_PICTURE_TYPE_P;
if (!c->prev.data[0]) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame\n");
return AVERROR_INVALIDDATA;
}
decode_13(avctx, c, c->pic.data[0], srcptr, c->prev.data[0]);
break;
default: