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

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Message-ID: <tencent_8B2EEC8C8567D4C6F652C48644498B2EC206@qq.com>
Date: Sat, 15 Mar 2025 15:09:39 +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/wireless/core.c b/net/wireless/core.c
index 12b780de8779..eed4c06cd40b 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -1477,12 +1477,13 @@ int cfg80211_register_netdevice(struct net_device *dev)
 	lockdep_assert_held(&rdev->wiphy.mtx);
 
 	/* we'll take care of this */
-	wdev->registered = true;
 	wdev->registering = true;
+	wiphy_unlock(&rdev->wiphy);
 	ret = register_netdevice(dev);
 	if (ret)
 		goto out;
 
+	wiphy_lock(&rdev->wiphy);
 	cfg80211_register_wdev(rdev, wdev);
 	ret = 0;
 out: