linux-kernel - Re: [PATCH] reconnect_one(): fix a missing error code

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Date:   Thu, 15 Jun 2017 12:26:14 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     NeilBrown <neilb@...e.com>
Cc:     "J. Bruce Fields" <bfields@...ldses.org>,
        "J. Bruce Fields" <bfields@...hat.com>,
        David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] reconnect_one(): fix a missing error code

On Thu, Jun 15, 2017 at 07:54:57AM +1000, NeilBrown wrote:
> On Wed, Jun 14 2017, J. Bruce Fields wrote:
> 
> > On Wed, Jun 14, 2017 at 12:30:02PM +0300, Dan Carpenter wrote:
> >> I found this bug by reviewing places where we do ERR_PTR(0) (which is
> >> NULL).
> >> 
> >> We used to return an error pointer if lookup_one_len() failed but we
> >> moved this code into a helper function and accidentally removed that.
> >> NULL is a valid return for this function but it's not what we intended.
> >> 
> >> Fixes: bbf7a8a3562f ("exportfs: move most of reconnect_path to helper function")
> >> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> >
> > ACK.  Agreed that the current code is wrong, and that this is the
> > correct fix.
> >
> > What I don't quite understand yet is what the impact of the bug would
> > be.
> >
> 
> It is interesting that reconnect_path() handles the possibility of
> reconnect_one() returning NULL, even though it will only do that if this
> "bug" is triggered.

No, we return NULL for the goto out_reconnected case.

regards,
dan carpenter