linux-kernel - Re: [syzbot] Re: [syzbot] [wpan?] [usb?] BUG: corrupted list in ieee802154_if

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Message-ID: <67334baf.050a0220.a0661.041a.GAE@google.com>
Date: Tue, 12 Nov 2024 04:35:59 -0800
From: syzbot <syzbot+985f827280dc3a6e7e92@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [wpan?] [usb?] BUG: corrupted list in ieee802154_if_remove

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Subject: Re: [syzbot] [wpan?] [usb?] BUG: corrupted list in ieee802154_if_remove
Author: lizhi.xu@...driver.com

net device has been unregistered, since the rcu grace period it must be run before ieee802154_if_remove

#syz test

diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c
index c0e2da5072be..6f24f1760969 100644
--- a/net/mac802154/iface.c
+++ b/net/mac802154/iface.c
@@ -684,7 +684,8 @@ void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 	ASSERT_RTNL();
 
 	mutex_lock(&sdata->local->iflist_mtx);
-	list_del_rcu(&sdata->list);
+	if (!list_empty(&sdata->local->interfaces))
+		list_del_rcu(&sdata->list);
 	mutex_unlock(&sdata->local->iflist_mtx);
 
 	synchronize_rcu();