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vc1: fix out of array reads in vc1_inv_trans_4x8_c() 

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-01 19:18:34 +01:00
parent af796ba4b8
commit 80c702efeb
1 changed files with 8 additions and 9 deletions
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17
libavcodec/vc1dsp.c
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@ -421,7 +421,6 @@ static void vc1_inv_trans_4x8_c(uint8_t *dest, int linesize, DCTELEM *block)
int i;
register int t1,t2,t3,t4,t5,t6,t7,t8;
DCTELEM *src, *dst;
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
src = block;
dst = block;
@ -457,14 +456,14 @@ static void vc1_inv_trans_4x8_c(uint8_t *dest, int linesize, DCTELEM *block)
t3 = 9 * src[ 8] - 16 * src[24] + 4 * src[40] + 15 * src[56];
t4 = 4 * src[ 8] - 9 * src[24] + 15 * src[40] - 16 * src[56];
dest[0*linesize] = cm[dest[0*linesize] + ((t5 + t1) >> 7)];
dest[1*linesize] = cm[dest[1*linesize] + ((t6 + t2) >> 7)];
dest[2*linesize] = cm[dest[2*linesize] + ((t7 + t3) >> 7)];
dest[3*linesize] = cm[dest[3*linesize] + ((t8 + t4) >> 7)];
dest[4*linesize] = cm[dest[4*linesize] + ((t8 - t4 + 1) >> 7)];
dest[5*linesize] = cm[dest[5*linesize] + ((t7 - t3 + 1) >> 7)];
dest[6*linesize] = cm[dest[6*linesize] + ((t6 - t2 + 1) >> 7)];
dest[7*linesize] = cm[dest[7*linesize] + ((t5 - t1 + 1) >> 7)];
dest[0*linesize] = av_clip_uint8(dest[0*linesize] + ((t5 + t1) >> 7));
dest[1*linesize] = av_clip_uint8(dest[1*linesize] + ((t6 + t2) >> 7));
dest[2*linesize] = av_clip_uint8(dest[2*linesize] + ((t7 + t3) >> 7));
dest[3*linesize] = av_clip_uint8(dest[3*linesize] + ((t8 + t4) >> 7));
dest[4*linesize] = av_clip_uint8(dest[4*linesize] + ((t8 - t4 + 1) >> 7));
dest[5*linesize] = av_clip_uint8(dest[5*linesize] + ((t7 - t3 + 1) >> 7));
dest[6*linesize] = av_clip_uint8(dest[6*linesize] + ((t6 - t2 + 1) >> 7));
dest[7*linesize] = av_clip_uint8(dest[7*linesize] + ((t5 - t1 + 1) >> 7));
src ++;
dest++;