linux-kernel - Re: [syzbot] [fs?] general protection fault in pidfs_free

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Message-ID: <20250624005552.1589-1-hdanton@sina.com>
Date: Tue, 24 Jun 2025 08:55:51 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+25317a459958aec47bfa@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] general protection fault in pidfs_free_pid

> Date: Mon, 23 Jun 2025 11:27:26 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    5d4809e25903 Add linux-next specific files for 20250620
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=150ef30c580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=58afc4b78b52b7e3
> dashboard link: https://syzkaller.appspot.com/bug?extid=25317a459958aec47bfa
> compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10a5330c580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12c9f6bc580000

#syz test

--- x/fs/pidfs.c
+++ y/fs/pidfs.c
@@ -150,7 +150,7 @@ void pidfs_free_pid(struct pid *pid)
 	 */
 	VFS_WARN_ON_ONCE(pid->stashed);
 
-	if (IS_ERR(attr))
+	if (IS_ERR(attr) || !attr)
 		return;
 
 	/*
--