Commit f6687bbb authored by Michael Niedermayer's avatar Michael Niedermayer

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

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 1ac0fa50)
Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parent 1400f1a1
......@@ -189,7 +189,7 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w
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]);\
......@@ -205,13 +205,9 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w
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(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
......
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