linux-kernel - Re: [PATCH v3 08/18] nvmet-fcloop: add missing fcloop_callback_host

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <eb8ef257-72d0-43df-9e46-c6fb8b1dbb7c@flourine.local>
Date: Wed, 2 Apr 2025 19:08:06 +0200
From: Daniel Wagner <dwagner@...e.de>
To: Hannes Reinecke <hare@...e.de>
Cc: Daniel Wagner <wagi@...nel.org>, 
	James Smart <james.smart@...adcom.com>, Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>, 
	Chaitanya Kulkarni <kch@...dia.com>, Keith Busch <kbusch@...nel.org>, linux-nvme@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/18] nvmet-fcloop: add missing
 fcloop_callback_host_done

On Tue, Mar 18, 2025 at 02:49:14PM +0100, Daniel Wagner wrote:
> On Tue, Mar 18, 2025 at 12:12:52PM +0100, Hannes Reinecke wrote:
> > On 3/18/25 11:40, Daniel Wagner wrote:
> > > Add the missing fcloop_call_host_done calls so that the caller
> > > frees resources when something goes wrong.
> > > 
> > > Signed-off-by: Daniel Wagner <wagi@...nel.org>
> > > ---
> > >   drivers/nvme/target/fcloop.c | 5 ++++-
> > >   1 file changed, 4 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
> > > index cadf081e3653c641b0afcb0968fc74299ab941d1..de23f0bc5599b6f8dd5c3713dd38c952e6fdda28 100644
> > > --- a/drivers/nvme/target/fcloop.c
> > > +++ b/drivers/nvme/target/fcloop.c
> > > @@ -966,9 +966,11 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
> > >   	}
> > >   	spin_unlock(&inireq->inilock);
> > > -	if (!tfcp_req)
> > > +	if (!tfcp_req) {
> > >   		/* abort has already been called */
> > > +		fcloop_call_host_done(fcpreq, tfcp_req, -ECANCELED);
> > 
> > Am I misreading things or will fcloop_call_host_done() crash on a NULL
> > tfcp_req ?
> >
> > In patch 3 fcloop_tfcp_req_put() doesn't check for a NULL argument...
> 
> There is NULL pointer check in fcloop_call_host_done eventually. It is
> in 'nvmet-fcloop: update refs on tfcp_req'. That hunk should be in this
> patch though.

Looking again with fresh eyes. Patch #3 is adding ref counting to the
lport. 'nvmet-fcloop: update refs on tfcp_req' (the patch before this
one) adds the NULL check. Nothing will crash here. Actually, I've run
into this crash when testing before the NULL check was there :)