[XFRM]: Always release dst_entry on error in xfrm_lookup

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/ipt_REJECT.c

@@ -92,10 +92,7 @@ static inline struct rtable *route_reverse(struct sk_buff *skb,
 	fl.fl_ip_sport = tcph->dest;
 	fl.fl_ip_dport = tcph->source;
 
-	if (xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0)) {
-		dst_release(&rt->u.dst);
-		rt = NULL;
-	}
+	xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0);
 
 	return rt;
 }

net/ipv6/datagram.c

@@ -175,10 +175,8 @@ int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 	if (final_p)
 		ipv6_addr_copy(&fl.fl6_dst, final_p);
 
-	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
-		dst_release(dst);
+	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 		goto out;
-	}
 
 	/* source address lookup done in ip6_dst_lookup */
 

net/ipv6/icmp.c

@@ -374,7 +374,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
 	if (err)
 		goto out;
 	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
-		goto out_dst_release;
+		goto out;
 
 	if (ipv6_addr_is_multicast(&fl.fl6_dst))
 		hlimit = np->mcast_hops;
@@ -469,7 +469,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
 	if (err)
 		goto out;
 	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
-		goto out_dst_release;
+		goto out;
 
 	if (ipv6_addr_is_multicast(&fl.fl6_dst))
 		hlimit = np->mcast_hops;
@@ -505,7 +505,6 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
 out_put: 
 	if (likely(idev != NULL))
 		in6_dev_put(idev);
-out_dst_release:
 	dst_release(dst);
 out: 
 	icmpv6_xmit_unlock();

net/ipv6/ndisc.c

@@ -447,10 +447,8 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
 		return;
 
 	err = xfrm_lookup(&dst, &fl, NULL, 0);
-	if (err < 0) {
-		dst_release(dst);
+	if (err < 0)
 		return;
-	}
 
 	if (inc_opt) {
 		if (dev->addr_len)
@@ -539,10 +537,8 @@ void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
 		return;
 
 	err = xfrm_lookup(&dst, &fl, NULL, 0);
-	if (err < 0) {
-		dst_release(dst);
+	if (err < 0)
 		return;
-	}
 
 	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
 	send_llinfo = dev->addr_len && !ipv6_addr_any(saddr);
@@ -616,10 +612,8 @@ void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
 		return;
 
 	err = xfrm_lookup(&dst, &fl, NULL, 0);
-	if (err < 0) {
-		dst_release(dst);
+	if (err < 0)
 		return;
-	}
 
 	len = sizeof(struct icmp6hdr);
 	if (dev->addr_len)
@@ -1353,10 +1347,8 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
 		return;
 
 	err = xfrm_lookup(&dst, &fl, NULL, 0);
-	if (err) {
-		dst_release(dst);
+	if (err)
 		return;
-	}
 
 	rt = (struct rt6_info *) dst;
 

net/ipv6/netfilter/ip6t_REJECT.c

@@ -100,11 +100,8 @@ static void send_reset(struct sk_buff *oldskb)
 	dst = ip6_route_output(NULL, &fl);
 	if (dst == NULL)
 		return;
-	if (dst->error ||
-	    xfrm_lookup(&dst, &fl, NULL, 0)) {
-		dst_release(dst);
+	if (dst->error || xfrm_lookup(&dst, &fl, NULL, 0))
 		return;
-	}
 
 	hh_len = (dst->dev->hard_header_len + 15)&~15;
 	nskb = alloc_skb(hh_len + 15 + dst->header_len + sizeof(struct ipv6hdr)

net/ipv6/raw.c

@@ -782,10 +782,8 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
 	if (final_p)
 		ipv6_addr_copy(&fl.fl6_dst, final_p);
 
-	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
-		dst_release(dst);
+	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 		goto out;
-	}
 
 	if (hlimit < 0) {
 		if (ipv6_addr_is_multicast(&fl.fl6_dst))

net/ipv6/tcp_ipv6.c

@@ -632,10 +632,8 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 	if (final_p)
 		ipv6_addr_copy(&fl.fl6_dst, final_p);
 
-	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
-		dst_release(dst);
+	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 		goto failure;
-	}
 
 	if (saddr == NULL) {
 		saddr = &fl.fl6_src;
@@ -888,7 +886,6 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
 	}
 
 done:
-	dst_release(dst);
         if (opt && opt != np->opt)
 		sock_kfree_s(sk, opt, opt->tot_len);
 	return err;
@@ -1000,10 +997,8 @@ static void tcp_v6_send_reset(struct sk_buff *skb)
 	/* sk = NULL, but it is safe for now. RST socket required. */
 	if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
 
-		if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) {
-			dst_release(buff->dst);
+		if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0)
 			return;
-		}
 
 		ip6_xmit(NULL, buff, &fl, NULL, 0);
 		TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
@@ -1067,10 +1062,8 @@ static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32
 	fl.fl_ip_sport = t1->source;
 
 	if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
-		if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) {
-			dst_release(buff->dst);
+		if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0)
 			return;
-		}
 		ip6_xmit(NULL, buff, &fl, NULL, 0);
 		TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
 		return;
@@ -1733,7 +1726,6 @@ static int tcp_v6_rebuild_header(struct sock *sk)
 
 		if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 			sk->sk_err_soft = -err;
-			dst_release(dst);
 			return err;
 		}
 
@@ -1786,7 +1778,6 @@ static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok)
 
 		if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 			sk->sk_route_caps = 0;
-			dst_release(dst);
 			return err;
 		}
 

net/ipv6/udp.c

@@ -799,10 +799,8 @@ static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
 	if (final_p)
 		ipv6_addr_copy(&fl->fl6_dst, final_p);
 
-	if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) {
-		dst_release(dst);
+	if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
 		goto out;
-	}
 
 	if (hlimit < 0) {
 		if (ipv6_addr_is_multicast(&fl->fl6_dst))

net/xfrm/xfrm_policy.c

@@ -765,8 +765,8 @@ int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
 	switch (policy->action) {
 	case XFRM_POLICY_BLOCK:
 		/* Prohibit the flow */
-		xfrm_pol_put(policy);
-		return -EPERM;
+		err = -EPERM;
+		goto error;
 
 	case XFRM_POLICY_ALLOW:
 		if (policy->xfrm_nr == 0) {
@@ -782,8 +782,8 @@ int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
 		 */
 		dst = xfrm_find_bundle(fl, policy, family);
 		if (IS_ERR(dst)) {
-			xfrm_pol_put(policy);
-			return PTR_ERR(dst);
+			err = PTR_ERR(dst);
+			goto error;
 		}
 
 		if (dst)