wireless: check for dangling wdev->current_bss pointer

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>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 4224e7554a76..672459b9483b 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -934,6 +934,12 @@ 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);
+                        wdev->current_bss = NULL;
+                }
                 break;
         case NETDEV_PRE_UP:
                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))