linux-kernel - Re: [syzbot] [rcu?] WARNING in rcu_note_context

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <tencent_A688921FDD9E5D95993ACFF58D87259B0D07@qq.com>
Date: Tue, 23 Jul 2024 21:44:10 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+784d0a1246a539975f05@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [rcu?] WARNING in rcu_note_context_switch (2)

miss rcu read unlock

#syz test: upstream 51835949dda3

diff --git a/fs/nsfs.c b/fs/nsfs.c
index a4a925dce331..e228d06f0949 100644
--- a/fs/nsfs.c
+++ b/fs/nsfs.c
@@ -188,8 +188,10 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl,
 			tsk = find_task_by_vpid(arg);
 		else
 			tsk = find_task_by_pid_ns(arg, pid_ns);
-		if (!tsk)
+		if (!tsk) {
+			rcu_read_unlock();
 			break;
+		}
 
 		switch (ioctl) {
 		case NS_GET_PID_FROM_PIDNS: