linux-kernel - [syzbot] [net?] KASAN: slab-use-after-free Write in l2tp_session

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Date: Thu, 27 Jun 2024 20:52:31 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+c041b4ce3a6dfd1e63e2@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] KASAN: slab-use-after-free Write in l2tp_session_delete

delete tunnl session list

#syz test: linux-next 185d72112b95

diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 3596290047b2..1fd27c902d80 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -446,6 +446,7 @@ static int pppol2tp_release(struct socket *sock)
 	if (session) {
 		struct pppol2tp_session *ps;
 
+		list_del_init(&session->list);
 		l2tp_session_delete(session);
 
 		ps = l2tp_session_priv(session);