netdev - [PATCH net] ipv6: sctp: fix lockdep splat in sctp_v6_get

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Message-ID: <1449505521.25029.65.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 07 Dec 2015 08:25:21 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dave Jones <davej@...emonkey.org.uk>,
	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: [PATCH net] ipv6: sctp: fix lockdep splat in sctp_v6_get_dst()

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

While cooking the sctp np->opt rcu fixes, I forgot to move
one rcu_read_unlock() after the added rcu_dereference() in
sctp_v6_get_dst()

This gave lockdep warnings reported by Dave Jones.

Fixes: c836a8ba9386 ("ipv6: sctp: add rcu protection around np->opt")
Reported-by: Dave Jones <davej@...emonkey.org.uk>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/sctp/ipv6.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index acb45b8c2a9d..d28c0b4c9128 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -323,14 +323,13 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
 			}
 		}
 	}
-	rcu_read_unlock();
-
 	if (baddr) {
 		fl6->saddr = baddr->v6.sin6_addr;
 		fl6->fl6_sport = baddr->v6.sin6_port;
 		final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
 		dst = ip6_dst_lookup_flow(sk, fl6, final_p);
 	}
+	rcu_read_unlock();
 
 out:
 	if (!IS_ERR_OR_NULL(dst)) {


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