netdev - [PATCH] ipv4: fix possible seqlock deadlock

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Message-ID: <1384465074.28716.41.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 14 Nov 2013 13:37:54 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dave Jones <davej@...hat.com>, David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: [PATCH] ipv4: fix possible seqlock deadlock

From: Eric Dumazet <edumazet@...gle.com>

ip4_datagram_connect() being called from process context,
it should use IP_INC_STATS() instead of IP_INC_STATS_BH()
otherwise we can deadlock on 32bit arches, or get corruptions of
SNMP counters.

Fixes: 584bdf8cbdf6 ("[IPV4]: Fix "ipOutNoRoutes" counter error for TCP and UDP")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Dave Jones <davej@...hat.com>
---
 net/ipv4/datagram.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/datagram.c b/net/ipv4/datagram.c
index b28e863fe0a7..19e36376d2a0 100644
--- a/net/ipv4/datagram.c
+++ b/net/ipv4/datagram.c
@@ -57,7 +57,7 @@ int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 	if (IS_ERR(rt)) {
 		err = PTR_ERR(rt);
 		if (err == -ENETUNREACH)
-			IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
+			IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
 		goto out;
 	}
 


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