linux-kernel - Re: KASAN: use-after-free Read in mnt_warn_timestamp

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Date:   Wed, 16 Oct 2019 18:47:55 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     syzbot <syzbot+76a43f2b4d34cfc53548@...kaller.appspotmail.com>
Cc:     akpm@...l.org, deepa.kernel@...il.com, hch@...radead.org,
        jlayton@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, lkundrak@...sk,
        syzkaller-bugs@...glegroups.com, tklauser@...rscht.ch,
        trond.myklebust@....uio.no, viro@...iv.linux.org.uk
Subject: Re: KASAN: use-after-free Read in mnt_warn_timestamp_expiry

On Wed, Oct 16, 2019 at 06:42:11PM -0700, syzbot wrote:
> ==================================================================
> BUG: KASAN: use-after-free in mnt_warn_timestamp_expiry+0x4a/0x250
> fs/namespace.c:2471
> Read of size 8 at addr ffff888099937328 by task syz-executor.1/18510
> 

Looks like a duplicate of this:

#syz dup: KASAN: use-after-free Read in do_mount

See the existing thread and proposed fix here:
https://lkml.kernel.org/linux-fsdevel/000000000000805e5505945a234b@google.com/T/#u

- Eric