netdev - [PATCH 5/13 net-3.1-stable] ipv4: fix lockdep splat in rt_cache_seq

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Message-Id: <20111206.163321.1118302066607130320.davem@davemloft.net>
Date:	Tue, 06 Dec 2011 16:33:21 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Subject: [PATCH 5/13 net-3.1-stable] ipv4: fix lockdep splat in
 rt_cache_seq_show


From: Eric Dumazet <eric.dumazet@...il.com>

[ Upstream commit 218fa90f072e4aeff9003d57e390857f4f35513e ]

After commit f2c31e32b378 (fix NULL dereferences in check_peer_redir()),
dst_get_neighbour() should be guarded by rcu_read_lock() /
rcu_read_unlock() section.

Reported-by: Miles Lane <miles.lane@...il.com>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
---
 net/ipv4/route.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 075212e..8b3661b 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -417,9 +417,13 @@ static int rt_cache_seq_show(struct seq_file *seq, void *v)
 	else {
 		struct rtable *r = v;
 		struct neighbour *n;
-		int len;
+		int len, HHUptod;
 
+		rcu_read_lock();
 		n = dst_get_neighbour(&r->dst);
+		HHUptod = (n && (n->nud_state & NUD_CONNECTED)) ? 1 : 0;
+		rcu_read_unlock();
+
 		seq_printf(seq, "%s\t%08X\t%08X\t%8X\t%d\t%u\t%d\t"
 			      "%08X\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n",
 			r->dst.dev ? r->dst.dev->name : "*",
@@ -433,7 +437,7 @@ static int rt_cache_seq_show(struct seq_file *seq, void *v)
 			      dst_metric(&r->dst, RTAX_RTTVAR)),
 			r->rt_key_tos,
 			-1,
-			(n && (n->nud_state & NUD_CONNECTED)) ? 1 : 0,
+			HHUptod,
 			r->rt_spec_dst, &len);
 
 		seq_printf(seq, "%*s\n", 127 - len, "");
-- 
1.7.7.3

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