cfg80211: process pending events when unregistering net device

commit 1f6fc43e621167492ed4b7f3b4269c584c3d6ccc upstream.

libertas currently calls cfg80211_disconnected() when it is being
brought down. This causes an event to be allocated, but since the
wdev is already removed from the rdev by the time that the event
processing work executes, the event is never processed or freed.
http://article.gmane.org/gmane.linux.kernel.wireless.general/95666

Fix this leak, and other possible situations, by processing the event
queue when a device is being unregistered. Thanks to Johannes Berg for
the suggestion.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 220f3bd176f89cc33192b72ddcc11f296cba54fd..8f5042d4e75e149da0770a9b3d649b2b4a8775fd 100644 (file)
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -971,6 +971,11 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
                 */
                synchronize_rcu();
                INIT_LIST_HEAD(&wdev->list);
+               /*
+                * Ensure that all events have been processed and
+                * freed.
+                */
+               cfg80211_process_wdev_events(wdev);
                break;
        case NETDEV_PRE_UP:
                if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))

diff --git a/net/wireless/core.h b/net/wireless/core.h
index b9ec3061ed722c4dc58b526d0c545ce64ad5f163..02c3be3fb8ca4df92d03e1ef47b93d2394890dd6 100644 (file)
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -426,6 +426,7 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
                          struct net_device *dev, enum nl80211_iftype ntype,
                          u32 *flags, struct vif_params *params);
 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
+void cfg80211_process_wdev_events(struct wireless_dev *wdev);
 
 int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
                                  struct wireless_dev *wdev,

diff --git a/net/wireless/util.c b/net/wireless/util.c
index b5e4c1cc5e7d04afef47c6fd0baa8425e68cac2d..22fb802ba30458a33ae100fac38fec376bd5ad9d 100644 (file)
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -725,7 +725,7 @@ void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
        wdev->connect_keys = NULL;
 }
 
-static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
+void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 {
        struct cfg80211_event *ev;
        unsigned long flags;