File openssl-CVE-2015-1788.patch of Package openssl.4769

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File openssl-CVE-2015-1788.patch of Package openssl.4769

commit 4924b37ee01f71ae19c94a8934b80eeb2f677932
Author: Andy Polyakov <appro@openssl.org>
Date:   Thu Jun 11 00:18:01 2015 +0200

bn/bn_gf2m.c: avoid infinite loop wich malformed ECParamters.
    
    CVE-2015-1788
    
    Reviewed-by: Matt Caswell <matt@openssl.org>

Index: openssl-1.0.1i/crypto/bn/bn_gf2m.c
===================================================================
--- openssl-1.0.1i.orig/crypto/bn/bn_gf2m.c	2015-06-12 09:46:24.360586854 +0200
+++ openssl-1.0.1i/crypto/bn/bn_gf2m.c	2015-06-12 09:48:11.218840146 +0200
@@ -568,9 +568,10 @@ int BN_GF2m_mod_inv(BIGNUM *r, const BIG
 		}
 #else
 	{
-	int i,	ubits = BN_num_bits(u),
-		vbits = BN_num_bits(v),	/* v is copy of p */
-		top = p->top;
+        int i;
+        int ubits = BN_num_bits(u);
+        int vbits = BN_num_bits(v); /* v is copy of p */
+        int top = p->top;
 	BN_ULONG *udp,*bdp,*vdp,*cdp;
 
 	bn_wexpand(u,top);	udp = u->d;
@@ -611,7 +612,12 @@ int BN_GF2m_mod_inv(BIGNUM *r, const BIG
 			ubits--;
 			}
 
-		if (ubits<=BN_BITS2 && udp[0]==1) break;
+            if (ubits <= BN_BITS2) {
+                if (udp[0] == 0) /* poly was reducible */
+                    goto err;
+                if (udp[0] == 1)
+                    break;
+            }
 
 		if (ubits<vbits)
 			{

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