ipsec-tools: CVE-2015-4047: null pointer dereference crash in racoon

See: https://bugs.gentoo.org/show_bug.cgi?id=550118

Downloaded from
https://gitweb.gentoo.org/repo/gentoo.git/tree/net-vpn/ipsec-tools/files/ipsec-tools-CVE-2015-4047.patch

See also
https://sources.debian.net/src/ipsec-tools/1:0.8.2%2B20140711-8/debian/patches/bug785778-null-pointer-deref.patch/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>

--- ./src/racoon/gssapi.c    9 Sep 2006 16:22:09 -0000       1.4
+++ ./src/racoon/gssapi.c    19 May 2015 15:16:00 -0000      1.6
@@ -192,6 +192,11 @@
	gss_name_t princ, canon_princ;
	OM_uint32 maj_stat, min_stat;
 
+	if (iph1->rmconf == NULL) {
+		plog(LLV_ERROR, LOCATION, NULL, "no remote config\n");
+		return -1;
+	}
+
	gps = racoon_calloc(1, sizeof (struct gssapi_ph1_state));
	if (gps == NULL) {
		plog(LLV_ERROR, LOCATION, NULL, "racoon_calloc failed\n");