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bn/asm/x86_64-mont.pl: fix for CVE-2016-7055 (Low severity).

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 2fac86d)
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dot-asm authored and mattcaswell committed Nov 6, 2016
1 parent 9ebcbbb commit 2a7dd548a6f5d6f7f84a89c98323b70a2822406e
Showing with 2 additions and 3 deletions.
  1. +2 −3 crypto/bn/asm/x86_64-mont.pl
@@ -1157,18 +1157,17 @@
mulx 2*8($aptr),%r15,%r13 # ...
adox -3*8($tptr),%r11
adcx %r15,%r12
adox $zero,%r12
adox -2*8($tptr),%r12
adcx $zero,%r13
adox $zero,%r13
mov $bptr,8(%rsp) # off-load &b[i]
.byte 0x67
mov $mi,%r15
imulq 24(%rsp),$mi # "t[0]"*n0
xor %ebp,%ebp # xor $zero,$zero # cf=0, of=0
mulx 3*8($aptr),%rax,%r14
mov $mi,%rdx
adox -2*8($tptr),%r12
adcx %rax,%r13
adox -1*8($tptr),%r13
adcx $zero,%r14

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