linux-kernel - [PATCH 3.4 044/125] net/neighbour: fix crash at dumping device-agnostic proxy entries

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Date:   Wed, 12 Oct 2016 20:32:40 +0800
From:   lizf@...nel.org
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Konstantin Khlebnikov <koct9i@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 044/125] net/neighbour: fix crash at dumping device-agnostic proxy entries

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

3.4.113-rc1 review patch.  If anyone has any objections, please let me know.

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


commit 6adc5fd6a142c6e2c80574c1db0c7c17dedaa42e upstream.

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>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 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 ebd4b21..dbd00df 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2186,7 +2186,7 @@ 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;
 
 	NLA_PUT(skb, NDA_DST, tbl->key_len, pn->key);
@@ -2259,7 +2259,7 @@ 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;
-- 
1.9.1