linux-kernel - Re: [PATCH] ceph: Fix an Oops in error handling

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Date:   Tue, 2 Feb 2021 17:19:57 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     David Howells <dhowells@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>, ceph-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ceph: Fix an Oops in error handling

On Tue, Feb 02, 2021 at 07:37:57AM -0500, Jeff Layton wrote:
> On Tue, 2021-02-02 at 08:47 +0300, Dan Carpenter wrote:
> > The "req" pointer is an error pointer and not NULL so this check needs
> > to be fixed.
> > 
> > Fixes: 1cf7fdf52d5a ("ceph: convert readpage to fscache read helper")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> > ---
> >  fs/ceph/addr.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> > index 5eec6f66fe52..fb0238a4d34f 100644
> > --- a/fs/ceph/addr.c
> > +++ b/fs/ceph/addr.c
> > @@ -273,7 +273,7 @@ static void ceph_netfs_issue_op(struct netfs_read_subrequest *subreq)
> >  	if (err)
> >  		iput(inode);
> >  out:
> > -	if (req)
> > +	if (!IS_ERR_OR_NULL(req))
> >  		ceph_osdc_put_request(req);
> >  	if (err)
> >  		netfs_subreq_terminated(subreq, err);
> 
> Good catch.
> 
> David, could you take this into your fscache-next branch?
> 
> Reviewed-by: Jeff Layton <jlayton@...nel.org>

Jeff sent a different fix for this.  Let's just apply his instead.

regards,
dan carpenter