linux-kernel - [ 044/135] ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev

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Message-Id: <20131011193950.047395991@linuxfoundation.org>
Date:	Fri, 11 Oct 2013 12:38:45 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Salam Noureddine <noureddine@...stanetworks.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 044/135] ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev_put

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

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

From: Salam Noureddine <noureddine@...stanetworks.com>

[ Upstream commit 9260d3e1013701aa814d10c8fc6a9f92bd17d643 ]

It is possible for the timer handlers to run after the call to
ipv6_mc_down so use in6_dev_put instead of __in6_dev_put in the
handler function in order to do proper cleanup when the refcnt
reaches 0. Otherwise, the refcnt can reach zero without the
inet6_dev being destroyed and we end up leaking a reference to
the net_device and see messages like the following,

unregister_netdevice: waiting for eth0 to become free. Usage count = 1

Tested on linux-3.4.43.

Signed-off-by: Salam Noureddine <noureddine@...stanetworks.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/mcast.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1862,7 +1862,7 @@ static void mld_dad_timer_expire(unsigne
 		if (idev->mc_dad_count)
 			mld_dad_start_timer(idev, idev->mc_maxdelay);
 	}
-	__in6_dev_put(idev);
+	in6_dev_put(idev);
 }
 
 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
@@ -2207,7 +2207,7 @@ static void mld_gq_timer_expire(unsigned
 
 	idev->mc_gq_running = 0;
 	mld_send_report(idev, NULL);
-	__in6_dev_put(idev);
+	in6_dev_put(idev);
 }
 
 static void mld_ifc_timer_expire(unsigned long data)
@@ -2220,7 +2220,7 @@ static void mld_ifc_timer_expire(unsigne
 		if (idev->mc_ifc_count)
 			mld_ifc_start_timer(idev, idev->mc_maxdelay);
 	}
-	__in6_dev_put(idev);
+	in6_dev_put(idev);
 }
 
 static void mld_ifc_event(struct inet6_dev *idev)


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