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xxan: check ybuf index before use. 

Fixes out of array access

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-11-17 04:45:38 +01:00
parent 774830050a
commit 8ad9b48c9b
1 changed files with 2 additions and 1 deletions
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3
libavcodec/xxan.c
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@ -289,7 +289,8 @@ static int xan_decode_frame_type0(AVCodecContext *avctx)
ybuf[j+1] = cur << 1; ybuf[j+1] = cur << 1;
last = cur; last = cur;
} }
ybuf[j] = last << 1; if(j < avctx->width)
ybuf[j] = last << 1;
prev_buf = ybuf; prev_buf = ybuf;
ybuf += avctx->width; ybuf += avctx->width;
} }