linux-kernel - Re: [syzbot] [wireless?] possible deadlock in ieee80211_change

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Message-ID: <tencent_FF211B3F4BBA1BCD253BBA0FBB3F33229E08@qq.com>
Date: Sun, 16 Mar 2025 09:04:45 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+30de9d963fdd95d745f8@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireless?] possible deadlock in ieee80211_change_mac (3)

#syz test

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 738de269e13f..87a970c18e96 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -301,7 +301,7 @@ static int ieee80211_change_mac(struct net_device *dev, void *addr)
 	 * active (maybe other cases?) and we must get removed from it.
 	 * But we really don't care anymore if it's not registered now.
 	 */
-	if (!dev->ieee80211_ptr->registered)
+	if (!dev->ieee80211_ptr->registered || dev->ieee80211_ptr->registering)
 		return 0;
 
 	guard(wiphy)(local->hw.wiphy);