[PATCH 4/6] wireless: Check for dangling wdev->current_bss pointer.

[greearb@candelatech.com]

From: Ben Greear <greearb@candelatech.com>

If it *is* still set when the netdev is being deleted,
then we are about to leak a pointer.  Warn and clean up
in that case.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 net/wireless/core.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/net/wireless/core.c b/net/wireless/core.c
index eb3e1de..9e05da9 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -1063,6 +1063,12 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 		 * freed.
 		 */
 		cfg80211_process_wdev_events(wdev);
+
+		if (WARN_ON(wdev->current_bss)) {
+			cfg80211_unhold_bss(wdev->current_bss);
+			cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
+			SET_BSS(wdev, NULL);
+		}
 		break;
 	case NETDEV_PRE_UP:
 		if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
-- 
1.7.3.4