netdev - [RFC] [PATCH] ipv6: Fix potential hang in mif6

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Message-Id: <20120502060957.30368.34595.sendpatchset@localhost.localdomain>
Date:	Wed, 02 May 2012 11:39:57 +0530
From:	Krishna Kumar <krkumar2@...ibm.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Krishna Kumar <krkumar2@...ibm.com>
Subject: [RFC] [PATCH] ipv6: Fix potential hang in mif6_add

Fix a potential "waiting for %s to become free" hang.
mif6_add() called ip6mr_reg_vif to allocate/register a
netdevice, which also took an extra reference on the
device. On error, mif6_add should drop this reference
before unregistering the device.

(untested, noticed from code walkthrough)

Signed-off-by: Krishna Kumar <krkumar2@...ibm.com>
---
 net/ipv6/ip6mr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -ruNp org/net/ipv6/ip6mr.c new/net/ipv6/ip6mr.c
--- org/net/ipv6/ip6mr.c	2012-04-19 09:03:34.000000000 +0530
+++ new/net/ipv6/ip6mr.c	2012-05-02 10:51:01.953110994 +0530
@@ -937,8 +937,8 @@ static int mif6_add(struct net *net, str
 			return -ENOBUFS;
 		err = dev_set_allmulti(dev, 1);
 		if (err) {
-			unregister_netdevice(dev);
 			dev_put(dev);
+			unregister_netdevice(dev);
 			return err;
 		}
 		break;

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