Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc

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To: Christoph Hellwig <hch@xxxxxx>
Subject: Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc
From: Christian Brauner <brauner@xxxxxxxxxx>
Date: Fri, 4 Aug 2023 16:49:18 +0200
Cc: syzbot <syzbot+2faac0423fdc9692822b@xxxxxxxxxxxxxxxxxxxxxxxxx>, jack@xxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, syzkaller-bugs@xxxxxxxxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx
In-reply-to: <20230804144343.GA28230@lst.de>

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.

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- Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc
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References:
- [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc
  - From: syzbot
- Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc
  - From: Christoph Hellwig
- Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc
  - From: Christian Brauner
- Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc
  - From: Christoph Hellwig
- Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc
  - From: Christian Brauner
- Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc
  - From: Christoph Hellwig

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