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[for-3.18,12/24] ipv6: sctp: fix lockdep splat in sctp_v6_get_dst()

Message ID 1494340968-17152-13-git-send-email-amit.pundir@linaro.org
State New
Headers show
Series Security fixes from 2015 and 2016 android security bulletins | expand

Commit Message

Amit Pundir May 9, 2017, 2:42 p.m. UTC 
From: Eric Dumazet <edumazet@google.com>


commit 69ce6487dcd364245a3d26322fc8f4ffd1e8d947 upstream.

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@codemonkey.org.uk>
Signed-off-by: Eric Dumazet <edumazet@google.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

---
 net/sctp/ipv6.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

-- 
2.7.4
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Patch

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index 15bc2886a529..5fb8b7b579f9 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)) {