linux-kernel - [ 7/9] ipv6: Dont dev_hold(dev) in ip6_mc_find_dev

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Date:	Wed, 21 Mar 2012 14:15:39 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, "RongQing.Li" <roy.qing.li@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 7/9] ipv6: Dont dev_hold(dev) in ip6_mc_find_dev_rcu.

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------


From: RongQing.Li <roy.qing.li@...il.com>

[ Upstream commit c577923756b7fe9071f28a76b66b83b306d1d001 ]

ip6_mc_find_dev_rcu() is called with rcu_read_lock(), so don't
need to dev_hold().
With dev_hold(), not corresponding dev_put(), will lead to leak.

[ bug introduced in 96b52e61be1 (ipv6: mcast: RCU conversions) ]

Signed-off-by: RongQing.Li <roy.qing.li@...il.com>
Acked-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/mcast.c |    1 -
 1 file changed, 1 deletion(-)

--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -257,7 +257,6 @@ static struct inet6_dev *ip6_mc_find_dev
 
 		if (rt) {
 			dev = rt->rt6i_dev;
-			dev_hold(dev);
 			dst_release(&rt->dst);
 		}
 	} else


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