From: Andy Polyakov <appro@openssl.org>
Date: Mon, 21 Nov 2016 14:15:52 +0000 (+0100)
Subject: bn/asm/ppc-mont.pl: signal no-op in 32-bit bit build.
X-Git-Tag: OpenSSL_1_1_1-pre1~2967
X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff_plain;h=90fc4832a392f60d2da2f5684d8d20ac8d91cebd;hp=20d14461fb179d00b4f8991fe9fd9560d71f8fb6

bn/asm/ppc-mont.pl: signal no-op in 32-bit bit build.

The bug was introduced in 80d27cdb84985c697f8fabb7649abf1f54714d13,
one too many instructions was removed. It went unnoticed, because
new subroutine introduced in previous commit is called in real-life
RSA/DSA/DH cases, while original code is called only in rare tests.
The bug was caught in test_fuzz.

Reviewed-by: Rich Salz <rsalz@openssl.org>
---

diff --git a/crypto/bn/asm/ppc-mont.pl b/crypto/bn/asm/ppc-mont.pl
index fdc049ae0e..b747f70132 100644
--- a/crypto/bn/asm/ppc-mont.pl
+++ b/crypto/bn/asm/ppc-mont.pl
@@ -135,6 +135,7 @@ $code=<<___;
 .align	5
 .bn_mul_mont_int:
 	mr	$rp,r3		; $rp is reassigned
+	li	r3,0
 ___
 $code.=<<___ if ($BNSZ==4);
 	cmpwi	$num,32		; longer key performance is not better