linux-kernel - [PATCH 3.18 10/45] ipv4: Map neigh lookup keys in __ipv4_neigh_lookup

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Message-Id: <20180215144118.045871977@linuxfoundation.org>
Date:   Thu, 15 Feb 2018 16:17:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wang Han <wanghan1995315@...il.com>
Subject: [PATCH 3.18 10/45] ipv4: Map neigh lookup keys in __ipv4_neigh_lookup_noref()

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wang Han <wanghan1995315@...il.com>

Commit 6c16fa957e84 is an incorrect backport as we map the keys in
struct __ipv4_neigh_lookup(), but the correct place to add the
code is struct __ipv4_neigh_lookup_noref(), compared to upstream.

Fix it by moving the code, or fewer cases will be covered as
__ipv4_neigh_lookup_noref() will be called unconditionally from
__ipv4_neigh_lookup(), and it can be called from other places
such as ip_output.c.

Fixes: 6c16fa957e84 (ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR_ANY)
Signed-off-by: Wang Han <wanghan1995315@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/arp.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/include/net/arp.h
+++ b/include/net/arp.h
@@ -22,6 +22,9 @@ static inline struct neighbour *__ipv4_n
 	struct neighbour *n;
 	u32 hash_val;
 
+	if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
+		key = INADDR_ANY;
+
 	hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
 	for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
 	     n != NULL;
@@ -37,9 +40,6 @@ static inline struct neighbour *__ipv4_n
 {
 	struct neighbour *n;
 
-	if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
-		key = INADDR_ANY;
-
 	rcu_read_lock_bh();
 	n = __ipv4_neigh_lookup_noref(dev, key);
 	if (n && !atomic_inc_not_zero(&n->refcnt))