linux-kernel - Re: Null-ptr-deref due to "vfs, fsinfo: Add an RCU safe per-ns mount list"

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Message-ID: <20200625112517.4cf8f3a9@canb.auug.org.au>
Date:   Thu, 25 Jun 2020 11:25:17 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Qian Cai <cai@....pw>
Cc:     David Howells <dhowells@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        paulmck@...nel.org, rcu@...r.kernel.org,
        torvalds@...ux-foundation.org
Subject: Re: Null-ptr-deref due to "vfs, fsinfo: Add an RCU safe per-ns
 mount list"

Hi all,

On Wed, 24 Jun 2020 11:57:07 -0400 Qian Cai <cai@....pw> wrote:
>
> On Wed, May 13, 2020 at 12:29:52AM +0100, David Howells wrote:
> > Qian Cai <cai@....pw> wrote:
> >   
> > > Reverted the linux-next commit ee8ad8190cb1 (“vfs, fsinfo: Add an RCU safe per-ns mount list”) fixed the null-ptr-deref.  
> > 
> > Okay, I'm dropping this commit for now.  
> 
> What's the point of re-adding this buggy patch to linux-next again since
> 0621 without fixing the previous reported issue at all? Reverting the
> commit will still fix the crash below immediately, i.e.,
> 
> dbc87e74d022 ("vfs, fsinfo: Add an RCU safe per-ns mount list")

I have added a revert of that commit to linux-next today.

-- 
Cheers,
Stephen Rothwell

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