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pngdec/filter: dont access out of array elements at the end 

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 1ac0fa50ef)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-02-12 19:53:40 +01:00
parent e6ac11e417
commit 41eda87048
1 changed files with 4 additions and 8 deletions
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12
libavcodec/pngdec.c
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@ -148,7 +148,7 @@ static void add_paeth_prediction_c(uint8_t *dst, uint8_t *src, uint8_t *top, int
if(bpp >= 2) g = dst[1];\
if(bpp >= 3) b = dst[2];\
if(bpp >= 4) a = dst[3];\
for(; i < size; i+=bpp) {\
for(; i <= size - bpp; i+=bpp) {\
dst[i+0] = r = op(r, src[i+0], last[i+0]);\
if(bpp == 1) continue;\
dst[i+1] = g = op(g, src[i+1], last[i+1]);\
@ -164,13 +164,9 @@ static void add_paeth_prediction_c(uint8_t *dst, uint8_t *src, uint8_t *top, int
else if(bpp == 2) UNROLL1(2, op)\
else if(bpp == 3) UNROLL1(3, op)\
else if(bpp == 4) UNROLL1(4, op)\
else {\
for (; i < size; i += bpp) {\
int j;\
for (j = 0; j < bpp; j++)\
dst[i+j] = op(dst[i+j-bpp], src[i+j], last[i+j]);\
}\
}
for (; i < size; i++) {\
dst[i] = op(dst[i-bpp], src[i], last[i]);\
}\
/* NOTE: 'dst' can be equal to 'last' */
static void png_filter_row(PNGDecContext *s, uint8_t *dst, int filter_type,