linux-kernel - Re: general protection fault in kernfs_add

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Message-ID: <CAHk-=wgR=8QX6A6iPAzsD-E38t6Uesa45yWLmeTWZTnK0GbRow@mail.gmail.com>
Date:   Wed, 20 Nov 2019 08:54:04 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     syzbot <syzbot+db1637662f412ac0d556@...kaller.appspotmail.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rafael Wysocki <rafael@...nel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Tejun Heo <tj@...nel.org>,
        linux-bluetooth <linux-bluetooth@...r.kernel.org>
Subject: Re: general protection fault in kernfs_add_one

On Tue, Nov 19, 2019 at 8:04 PM Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
>
> Could this be what was fixed by:
>
> ac43432cb1f5c2950408534987e57c2071e24d8f
> ("driver core: Fix use-after-free and double free on glue directory")
>
> Which went into 5.3 afaik ?

Hmm. Sounds very possible. It matches the commit syzbot bisected to,
and looking at the reports, the I can't find anything that is 5.3 or
later.

I did find a 5.3.0-rc2+ report, but that's still consistent with that
commit: it got merged just before 5.3-rc4.

So I think you're right.

I forget what the magic email rule was to report that something is
fixed to syzbot..

              Linus