From c1d3ad84eae35414b6b334790048406bd6301b12 Mon Sep 17 00:00:00 2001
From: Denis Kenzior <denkenz@gmail.com>
Date: Wed, 28 Aug 2019 16:11:10 -0500
Subject: [PATCH] cfg80211: Purge frame registrations on iftype change
Git-commit: c1d3ad84eae35414b6b334790048406bd6301b12
Patch-mainline: v5.4-rc1
References: bsc#1051510

Currently frame registrations are not purged, even when changing the
interface type.  This can lead to potentially weird situations where
frames possibly not allowed on a given interface type remain registered
due to the type switching happening after registration.

The kernel currently relies on userspace apps to actually purge the
registrations themselves, this is not something that the kernel should
rely on.

Add a call to cfg80211_mlme_purge_registrations() to forcefully remove
any registrations left over prior to switching the iftype.

Cc: stable@vger.kernel.org
Signed-off-by: Denis Kenzior <denkenz@gmail.com>
Link: https://lore.kernel.org/r/20190828211110.15005-1-denkenz@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 net/wireless/util.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 006f3eac00f7..633f6a331040 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -964,6 +964,7 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 		}
 
 		cfg80211_process_rdev_events(rdev);
+		cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
 	}
 
 	err = rdev_change_virtual_intf(rdev, dev, ntype, params);
-- 
2.16.4