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xldec: Check that width is a multiple of 4

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Fixes out of array reads

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-21 21:29:48 +02:00
parent 80d51680b2
commit 94b42da696
1 changed files with 5 additions and 0 deletions
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libavcodec/xl.c
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@ -52,6 +52,11 @@ static int decode_frame(AVCodecContext *avctx,
uint32_t val;
int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
if (avctx->width & 3) {
av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n");
return AVERROR_INVALIDDATA;
}
if(p->data[0])
avctx->release_buffer(avctx, p);