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Message-Id: <20240405230243.1067-1-hdanton@sina.com>
Date: Sat, 6 Apr 2024 07:02:43 +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
Test Al's idea.
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fe46a7dd189e
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -639,6 +639,8 @@ static int kernfs_fop_open(struct inode
*/
if (has_mmap)
mutex_init(&of->mutex);
+ else if (file->f_mode & FMODE_WRITE)
+ mutex_init(&of->mutex);
else
mutex_init(&of->mutex);
--
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