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dirac/x86: Fix handling blocksizes that are not a multiple of 4

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Fixes out of array accesses

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
pull/9/head
Michael Niedermayer 12 years ago
parent 5c9cae7447
commit 94ef1667bb
1 changed files with 28 additions and 4 deletions
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  1. 32
      libavcodec/x86/dsputil_mmx.c

32
libavcodec/x86/dsputil_mmx.c
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@ -1612,16 +1612,26 @@ void ff_avg_vc1_mspel_mc00_mmxext(uint8_t *dst, const uint8_t *src,
#define DIRAC_PIXOP(OPNAME2, OPNAME, EXT)\
void ff_ ## OPNAME2 ## _dirac_pixels8_ ## EXT(uint8_t *dst, const uint8_t *src[5], int stride, int h)\
{\
OPNAME ## _pixels8_ ## EXT(dst, src[0], stride, h);\
if (h&3)\
ff_ ## OPNAME2 ## _dirac_pixels8_c(dst, src, stride, h);\
else\
OPNAME ## _pixels8_ ## EXT(dst, src[0], stride, h);\
}\
void ff_ ## OPNAME2 ## _dirac_pixels16_ ## EXT(uint8_t *dst, const uint8_t *src[5], int stride, int h)\
{\
OPNAME ## _pixels16_ ## EXT(dst, src[0], stride, h);\
if (h&3)\
ff_ ## OPNAME2 ## _dirac_pixels16_c(dst, src, stride, h);\
else\
OPNAME ## _pixels16_ ## EXT(dst, src[0], stride, h);\
}\
void ff_ ## OPNAME2 ## _dirac_pixels32_ ## EXT(uint8_t *dst, const uint8_t *src[5], int stride, int h)\
{\
OPNAME ## _pixels16_ ## EXT(dst , src[0] , stride, h);\
OPNAME ## _pixels16_ ## EXT(dst+16, src[0]+16, stride, h);\
if (h&3) {\
ff_ ## OPNAME2 ## _dirac_pixels32_c(dst, src, stride, h);\
} else {\
OPNAME ## _pixels16_ ## EXT(dst , src[0] , stride, h);\
OPNAME ## _pixels16_ ## EXT(dst+16, src[0]+16, stride, h);\
}\
}
DIRAC_PIXOP(put, put, mmx)
@ -1631,21 +1641,35 @@ DIRAC_PIXOP(avg, ff_avg, mmxext)
#if HAVE_YASM
void ff_put_dirac_pixels16_sse2(uint8_t *dst, const uint8_t *src[5], int stride, int h)
{
if (h&3)
ff_put_dirac_pixels16_c(dst, src, stride, h);
else
ff_put_pixels16_sse2(dst, src[0], stride, h);
}
void ff_avg_dirac_pixels16_sse2(uint8_t *dst, const uint8_t *src[5], int stride, int h)
{
if (h&3)
ff_avg_dirac_pixels16_c(dst, src, stride, h);
else
ff_avg_pixels16_sse2(dst, src[0], stride, h);
}
void ff_put_dirac_pixels32_sse2(uint8_t *dst, const uint8_t *src[5], int stride, int h)
{
if (h&3) {
ff_put_dirac_pixels32_c(dst, src, stride, h);
} else {
ff_put_pixels16_sse2(dst , src[0] , stride, h);
ff_put_pixels16_sse2(dst+16, src[0]+16, stride, h);
}
}
void ff_avg_dirac_pixels32_sse2(uint8_t *dst, const uint8_t *src[5], int stride, int h)
{
if (h&3) {
ff_avg_dirac_pixels32_c(dst, src, stride, h);
} else {
ff_avg_pixels16_sse2(dst , src[0] , stride, h);
ff_avg_pixels16_sse2(dst+16, src[0]+16, stride, h);
}
}
#endif
#endif

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