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

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Date:   Fri, 4 Aug 2023 16:49:18 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     syzbot <syzbot+2faac0423fdc9692822b@...kaller.appspotmail.com>,
        jack@...e.cz, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in
 test_bdev_super_fc

On Fri, Aug 04, 2023 at 04:43:43PM +0200, Christoph Hellwig wrote:
> On Fri, Aug 04, 2023 at 04:36:49PM +0200, Christian Brauner wrote:
> > FFS
> 
> Good spot, this explains the missing dropping of s_umount.
> 
> But I don't think it's doing the right thing for MTD mount romfs,
> we'll need something like this:

I'll fold a fix into Jan's patch.