From: Andy Polyakov <appro@openssl.org>
Date: Wed, 2 Jul 2014 17:35:50 +0000 (+0200)
Subject: bn_exp.c: fix x86_64-specific crash with one-word modulus.
X-Git-Tag: master-post-reformat~622
X-Git-Url: https://git.openssl.org/?p=openssl.git;a=commitdiff_plain;h=eca441b2b4d33d2a18d163ef9b4b3aff14251c73

bn_exp.c: fix x86_64-specific crash with one-word modulus.

PR: #3397
---

diff --git a/crypto/bn/bn_exp.c b/crypto/bn/bn_exp.c
index c121122f3c..2d051b2c35 100644
--- a/crypto/bn/bn_exp.c
+++ b/crypto/bn/bn_exp.c
@@ -909,7 +909,7 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
 
     /* Dedicated window==4 case improves 512-bit RSA sign by ~15%, but as
      * 512-bit RSA is hardly relevant, we omit it to spare size... */ 
-    if (window==5)
+    if (window==5 && top>1)
 	{
 	void bn_mul_mont_gather5(BN_ULONG *rp,const BN_ULONG *ap,
 			const void *table,const BN_ULONG *np,