linux-kernel - Re: [syzbot] [mptcp?] KASAN: slab-use-after-free Read in __timer_delete

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Message-ID: <tencent_DD4C79766E502D6D6E1494B4E88AED6ECE0A@qq.com>
Date: Wed,  4 Sep 2024 08:20:29 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+f3a31fb909db9b2a5c4d@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [mptcp?] KASAN: slab-use-after-free Read in __timer_delete_sync

entry need to be protected by pm.lock.

#syz test

Upstream-Status: Pending

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 3e4ad801786f..d4cbf7dcf983 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1430,8 +1430,10 @@ static bool remove_anno_list_by_saddr(struct mptcp_sock *msk,
 
 	entry = mptcp_pm_del_add_timer(msk, addr, false);
 	if (entry) {
+		spin_lock_bh(&msk->pm.lock);
 		list_del(&entry->list);
 		kfree(entry);
+		spin_unlock_bh(&msk->pm.lock);
 		return true;
 	}