From: Bodo Möller <bodo@openssl.org>
Date: Wed, 7 Aug 2002 07:53:47 +0000 (+0000)
Subject: avoid SIGSEGV
X-Git-Tag: OpenSSL_0_9_7-beta4~203^2~36
X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff_plain;h=7a8645d1716d7f84435b0f3d8d2fd122d6f75113;hp=5bf738737da9c9c09a73686f945c22d5eb2e1a74

avoid SIGSEGV

Submitted by: Nils Larsch, Douglas Stebila
---

diff --git a/crypto/bn/bn_gf2m.c b/crypto/bn/bn_gf2m.c
index c969685c87..8bd17e0e7c 100644
--- a/crypto/bn/bn_gf2m.c
+++ b/crypto/bn/bn_gf2m.c
@@ -316,10 +316,10 @@ int BN_GF2m_mod_arr(BIGNUM *r, const BIGNUM *a, const unsigned int p[])
 	int n, dN, d0, d1;
 	BN_ULONG zz, *z;
 	
-	/* Since the algorithm does reduction in place, if a == r, copy the
+	/* Since the algorithm does reduction in the r value, if a != r, copy the
 	 * contents of a into r so we can do reduction in r. 
 	 */
-	if ((a != NULL) && (a->d != r->d))
+	if (a != r)
 		{
 		if (!bn_wexpand(r, a->top)) return 0;
 		for (j = 0; j < a->top; j++)
@@ -427,7 +427,7 @@ int	BN_GF2m_mod_mul_arr(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const unsig
 	BN_CTX_start(ctx);
 	if ((s = BN_CTX_get(ctx)) == NULL) goto err;
 	
-	zlen = a->top + b->top;
+	zlen = a->top + b->top + 4;
 	if (!bn_wexpand(s, zlen)) goto err;
 	s->top = zlen;