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s390/qeth: cancel close_dev work before removing a card 

A card's close_dev work is scheduled on a driver-wide workqueue. If the
card is removed and freed while the work is still active, this causes a
use-after-free.
So make sure that the work is completed before freeing the card.

Fixes: 0f54761d16 ("qeth: Support VEPA mode")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2019-02-04 17:40:08 +01:00 committed by David S. Miller
parent afa0c5904b
commit c2780c1a3f
3 changed files with 4 additions and 0 deletions
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1
drivers/s390/net/qeth_core.h
View File

@ -22,6 +22,7 @@
#include <linux/hashtable.h>
#include <linux/ip.h>
#include <linux/refcount.h>
#include <linux/workqueue.h>
#include <net/ipv6.h>
#include <net/if_inet6.h>

2
drivers/s390/net/qeth_l2_main.c
View File

@ -801,6 +801,8 @@ static void qeth_l2_remove_device(struct ccwgroup_device *cgdev)
if (cgdev->state == CCWGROUP_ONLINE)
qeth_l2_set_offline(cgdev);
cancel_work_sync(&card->close_dev_work);
if (qeth_netdev_is_registered(card->dev))
unregister_netdev(card->dev);
}

1
drivers/s390/net/qeth_l3_main.c
View File

@ -2338,6 +2338,7 @@ static void qeth_l3_remove_device(struct ccwgroup_device *cgdev)
if (cgdev->state == CCWGROUP_ONLINE)
qeth_l3_set_offline(cgdev);
cancel_work_sync(&card->close_dev_work);
if (qeth_netdev_is_registered(card->dev))
unregister_netdev(card->dev);
qeth_l3_clear_ip_htable(card, 0);