diff mbox

[net-next-2.6] sctp: ipv6: avoid touching device refcount

Message ID 4AF1ECBA.6070301@gmail.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Eric Dumazet Nov. 4, 2009, 9:06 p.m. UTC 
Avoid touching device refcount in sctp/ipv6, thanks to RCU

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
 net/sctp/ipv6.c |   19 +++++++++++--------
 1 files changed, 11 insertions(+), 8 deletions(-)

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Comments

David Miller Nov. 6, 2009, 5:08 a.m. UTC | #1 
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 04 Nov 2009 22:06:02 +0100

> Avoid touching device refcount in sctp/ipv6, thanks to RCU
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>

Applied to net-next-2.6
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diff mbox

Patch

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index bb280e6..7691527 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -837,15 +837,16 @@  static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 		if (type & IPV6_ADDR_LINKLOCAL) {
 			if (!addr->v6.sin6_scope_id)
 				return 0;
-			dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
-			if (!dev)
-				return 0;
-			if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
+			rcu_read_lock();
+			dev = dev_get_by_index_rcu(&init_net,
+						   addr->v6.sin6_scope_id);
+			if (!dev ||
+			    !ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
 					   dev, 0)) {
-				dev_put(dev);
+				rcu_read_unlock();
 				return 0;
 			}
-			dev_put(dev);
+			rcu_read_unlock();
 		} else if (type == IPV6_ADDR_MAPPED) {
 			if (!opt->v4mapped)
 				return 0;
@@ -873,10 +874,12 @@  static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 		if (type & IPV6_ADDR_LINKLOCAL) {
 			if (!addr->v6.sin6_scope_id)
 				return 0;
-			dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
+			rcu_read_lock();
+			dev = dev_get_by_index_rcu(&init_net,
+						   addr->v6.sin6_scope_id);
+			rcu_read_unlock();
 			if (!dev)
 				return 0;
-			dev_put(dev);
 		}
 		af = opt->pf->af;
 	}