linux-kernel - [PATCH 3.12 19/91] net/neighbour: fix crash at dumping device-agnostic proxy entries

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Message-Id: <18e7027fea6a8487e2dd627624de1ade82e793a5.1452015822.git.jslaby@suse.cz>
Date:	Tue,  5 Jan 2016 18:46:03 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Konstantin Khlebnikov <koct9i@...il.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 19/91] net/neighbour: fix crash at dumping device-agnostic proxy entries

From: Konstantin Khlebnikov <koct9i@...il.com>

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

===============

[ Upstream commit 6adc5fd6a142c6e2c80574c1db0c7c17dedaa42e ]

Proxy entries could have null pointer to net-device.

Signed-off-by: Konstantin Khlebnikov <koct9i@...il.com>
Fixes: 84920c1420e2 ("net: Allow ipv6 proxies and arp proxies be shown with iproute2")
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/core/neighbour.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 7453923dc507..7957daa334cc 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2210,7 +2210,7 @@ static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn,
 	ndm->ndm_pad2    = 0;
 	ndm->ndm_flags	 = pn->flags | NTF_PROXY;
 	ndm->ndm_type	 = NDA_DST;
-	ndm->ndm_ifindex = pn->dev->ifindex;
+	ndm->ndm_ifindex = pn->dev ? pn->dev->ifindex : 0;
 	ndm->ndm_state	 = NUD_NONE;
 
 	if (nla_put(skb, NDA_DST, tbl->key_len, pn->key))
@@ -2284,7 +2284,7 @@ static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
 		if (h > s_h)
 			s_idx = 0;
 		for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) {
-			if (dev_net(n->dev) != net)
+			if (pneigh_net(n) != net)
 				continue;
 			if (idx < s_idx)
 				goto next;
-- 
2.6.4

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