linux-kernel - Re: [PATCH] ovl: avoid deadlock in ovl_create

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Message-ID: <CAJfpegtiqWwr93_rtXU3YyJLmtHOtP8TAKQN0FLKVN5Yaz1EZw@mail.gmail.com>
Date: Fri, 14 Jun 2024 08:53:57 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: Lizhi Xu <lizhi.xu@...driver.com>
Cc: syzbot+b778ac10fe2a0cd72517@...kaller.appspotmail.com, amir73il@...il.com, 
	linux-kernel@...r.kernel.org, linux-unionfs@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] ovl: avoid deadlock in ovl_create_tmpfile

On Fri, 14 Jun 2024 at 03:05, Lizhi Xu <lizhi.xu@...driver.com> wrote:
>
> ovl_copy_up() will retrieve sb_writers, and ovl_want_write will also retrieve
> sb_writers, adjusting the order of their execution to avoid deadlocks.
>
> Reported-by: syzbot+b778ac10fe2a0cd72517@...kaller.appspotmail.com
> Signed-off-by: Lizhi Xu <lizhi.xu@...driver.com>

Thank you.

This is already fixed in:

git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs.git #overlayfs-next

Will send a pull request to Linus in the following weeks.

Thanks,
Miklos