From 69567687b0b7ed67831c17a010f4d46dfd059aef Mon Sep 17 00:00:00 2001 From: Andy Polyakov Date: Wed, 20 May 2015 09:36:48 +0200 Subject: [PATCH] bn/asm/x86_64-mont5.pl: fix valgrind error. bn_get_bits5 was overstepping array boundary by 1 byte. It was exclusively read overstep and data could not have been used. The only potential problem would be if array happens to end on the very edge of last accesible page. Reviewed-by: Richard Levitte --- crypto/bn/asm/x86_64-mont5.pl | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/crypto/bn/asm/x86_64-mont5.pl b/crypto/bn/asm/x86_64-mont5.pl index 69e81bf4dd..aa96d43e89 100755 --- a/crypto/bn/asm/x86_64-mont5.pl +++ b/crypto/bn/asm/x86_64-mont5.pl @@ -3231,11 +3231,16 @@ $code.=<<___; .type bn_get_bits5,\@abi-omnipotent .align 16 bn_get_bits5: - mov $inp,%r10 + lea 0($inp),%r10 + lea 1($inp),%r11 mov $num,%ecx - shr \$3,$num - movzw (%r10,$num),%eax - and \$7,%ecx + shr \$4,$num + and \$15,%ecx + lea -8(%ecx),%eax + cmp \$11,%ecx + cmova %r11,%r10 + cmova %eax,%ecx + movzw (%r10,$num,2),%eax shrl %cl,%eax and \$31,%eax ret -- 2.25.1