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swscale/x86/rgb2rgb_template: Fix planar2x() for short width 

Fixes: 451b3e0cf956c0bd2f27ed753ac24050/asan_heap-oob_2873c01_3231_7ed10a9464d15f0d57277f5917c566a8.AVI

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-01-17 12:33:50 +01:00
parent a6dc1eb837
commit c8a9aaab26
1 changed files with 8 additions and 1 deletions
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9
libswscale/x86/rgb2rgb_template.c
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@ -1434,7 +1434,9 @@ static inline void RENAME(planar2x)(const uint8_t *src, uint8_t *dst, int srcWid
dst+= dstStride;
for (y=1; y<srcHeight; y++) {
const x86_reg mmxSize= srcWidth&~15;
x86_reg mmxSize= srcWidth&~15;
if (mmxSize) {
__asm__ volatile(
"mov %4, %%"REG_a" \n\t"
"movq "MANGLE(mmx_ff)", %%mm0 \n\t"
@ -1481,6 +1483,11 @@ static inline void RENAME(planar2x)(const uint8_t *src, uint8_t *dst, int srcWid
NAMED_CONSTRAINTS_ADD(mmx_ff)
: "%"REG_a
);
} else {
mmxSize = 1;
dst[0] = (src[0] * 3 + src[srcStride]) >> 2;
dst[dstStride] = (src[0] + 3 * src[srcStride]) >> 2;
}
for (x=mmxSize-1; x<srcWidth-1; x++) {
dst[2*x +1]= (3*src[x+0] + src[x+srcStride+1])>>2;