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motionpixels: check extradata size 

Fixes null ptr derefernce
Fixes Ticket1363

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 50122084a6)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-05-28 17:17:49 +02:00
parent a85c3fff37
commit 25594f0018
1 changed files with 5 additions and 0 deletions
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5
libavcodec/motionpixels.c
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@ -55,6 +55,11 @@ static av_cold int mp_decode_init(AVCodecContext *avctx)
int w4 = (avctx->width + 3) & ~3;
int h4 = (avctx->height + 3) & ~3;
if(avctx->extradata_size < 2){
av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
return AVERROR_INVALIDDATA;
}
motionpixels_tableinit();
mp->avctx = avctx;
dsputil_init(&mp->dsp, avctx);