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ipv4 igmp: use in_dev_put in timer handlers instead of __in_dev_put 

[ Upstream commit e2401654dd0f5f3fb7a8d80dad9554d73d7ca394 ]

It is possible for the timer handlers to run after the call to
ip_mc_down so use in_dev_put instead of __in_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 in_device 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@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Salam Noureddine 2013-09-29 13:39:42 -07:00 committed by Greg Kroah-Hartman
parent 102ce961c8
commit fbf96d75f4
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/igmp.c
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@ -709,7 +709,7 @@ static void igmp_gq_timer_expire(unsigned long data)
in_dev->mr_gq_running = 0;
igmpv3_send_report(in_dev, NULL);
__in_dev_put(in_dev);
in_dev_put(in_dev);
}
static void igmp_ifc_timer_expire(unsigned long data)
@ -721,7 +721,7 @@ static void igmp_ifc_timer_expire(unsigned long data)
in_dev->mr_ifc_count--;
igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
}
__in_dev_put(in_dev);
in_dev_put(in_dev);
}
static void igmp_ifc_event(struct in_device *in_dev)