linux-kernel - Re: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_open

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Date:   Tue, 8 Aug 2023 19:22:19 +0200
From:   Christoph Hellwig <hch@....de>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, clm@...com, dsterba@...e.com,
        josef@...icpanda.com, linux-btrfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        syzbot <syzbot+26860029a4d562566231@...kaller.appspotmail.com>
Subject: Re: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in
 btrfs_open_devices

On Tue, Aug 08, 2023 at 06:35:04PM +0200, Christian Brauner wrote:
> On Tue, Aug 08, 2023 at 06:01:41PM +0200, Christoph Hellwig wrote:
> > Yes, probably.  The lifetimes looked fishy to me to start with, but
> > this might have made things worse.
> 
> It looks like we should be able to just drop that patch.
> Ok, are you fixing this or should I drop this patch?

I plan to fix it, but you can drop it for.  If we want to go on top
drop get_super like the preview series I sent you we'll eventually need
something like this patch back, though.