[PATCH 3.8 54/81] ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev_put

From: Kamal Mostafa
Date: Tue Oct 29 2013 - 14:09:23 EST -stable review patch. If anyone has any objections, please let me know.


From: Salam Noureddine <noureddine@xxxxxxxxxxxxxxxxxx>

[ 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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
net/ipv6/mcast.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 79fa628..ac1b533 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -2155,7 +2155,7 @@ static void mld_gq_timer_expire(unsigned long data)

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)
@@ -2168,7 +2168,7 @@ static void mld_ifc_timer_expire(unsigned long data)
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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