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Date: Thu, 4 Apr 2024 08:42:57 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+9a5b0ced8b1bfb238b56@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernfs?] possible deadlock in kernfs_fop_llseek
On Wed, 03 Apr 2024 11:23:26 -0700
> syzbot found the following issue on:
>
> HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
> git tree: upstream
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c38139180000
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fe46a7dd189e
--- x/fs/overlayfs/file.c
+++ y/fs/overlayfs/file.c
@@ -204,6 +204,7 @@ static loff_t ovl_llseek(struct file *fi
if (ret)
return ret;
+ inode_lock(inode);
/*
* Overlay file f_pos is the master copy that is preserved
* through copy up and modified on read/write, but only real
@@ -220,6 +221,7 @@ static loff_t ovl_llseek(struct file *fi
file->f_pos = real.file->f_pos;
ovl_inode_unlock(inode);
+ inode_unlock(inode);
fdput(real);
--
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