[IPSEC]: Initialize flow key properly in decode_session.

net/ipv4/xfrm4_policy.c

@@ -172,6 +172,7 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl)
 	struct iphdr *iph = skb->nh.iph;
 	u8 *xprth = skb->nh.raw + iph->ihl*4;
 
+	memset(fl, 0, sizeof(struct flowi));
 	if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
 		switch (iph->protocol) {
 		case IPPROTO_UDP:
@@ -212,8 +213,6 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl)
 			fl->fl_ipsec_spi = 0;
 			break;
 		};
-	} else {
-		memset(fl, 0, sizeof(struct flowi));
 	}
 	fl->proto = iph->protocol;
 	fl->fl4_dst = iph->daddr;

net/ipv6/xfrm6_policy.c

@@ -177,6 +177,7 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl)
 	struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
 	u8 nexthdr = skb->nh.ipv6h->nexthdr;
 
+	memset(fl, 0, sizeof(struct flowi));
 	ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
 	ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);