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h264: add overread protection to get_cabac_bypass_sign_x86().

This commit is contained in:
Ronald S. Bultje 2012-03-17 08:58:48 -07:00
parent 95bfa4ead7
commit a0bdcb019e
1 changed files with 5 additions and 3 deletions
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8
libavcodec/x86/cabac.h
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@ -105,7 +105,7 @@ static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val)
{
x86_reg tmp;
__asm__ volatile(
"movl %a5(%2), %k1 \n\t"
"movl %a6(%2), %k1 \n\t"
"movl %a3(%2), %%eax \n\t"
"shl $17, %k1 \n\t"
"add %%eax, %%eax \n\t"
@ -122,9 +122,10 @@ static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val)
"movzwl (%1), %%edx \n\t"
"bswap %%edx \n\t"
"shrl $15, %%edx \n\t"
"add $2, %1 \n\t"
"addl %%edx, %%eax \n\t"
"mov %1, %a4(%2) \n\t"
"cmp %a5(%2), %1 \n\t"
"jge 1f \n\t"
"add"OPSIZE" $2, %a4(%2) \n\t"
"1: \n\t"
"movl %%eax, %a3(%2) \n\t"
@ -132,6 +133,7 @@ static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val)
: "r"(c),
"i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream)),
"i"(offsetof(CABACContext, bytestream_end)),
"i"(offsetof(CABACContext, range))
: "%eax", "%edx", "memory"
);