linux-kernel - Re: [EXT] Re: [net PATCH 5/9] octeontx2-pf: mcs: Fix NULL pointer dereferences

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Message-ID: <20230426065213.GJ27649@unreal>
Date:   Wed, 26 Apr 2023 09:52:13 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Subbaraya Sundeep Bhatta <sbhatta@...vell.com>,
        Geethasowjanya Akula <gakula@...vell.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>
Subject: Re: [EXT] Re: [net PATCH 5/9] octeontx2-pf: mcs: Fix NULL pointer
 dereferences

On Wed, Apr 26, 2023 at 09:16:54AM +0300, Leon Romanovsky wrote:
> On Tue, Apr 25, 2023 at 08:51:40AM -0700, Jakub Kicinski wrote:
> > On Mon, 24 Apr 2023 10:29:02 +0000 Subbaraya Sundeep Bhatta wrote:
> > > >How did you get call to .mdo_del_secy if you didn't add any secy?
> > > >
> > > >Thanks
> > > >  
> > > It is because of the order of teardown in otx2_remove:
> > >         cn10k_mcs_free(pf);
> > >         unregister_netdev(netdev);
> > > 
> > > cn10k_mcs_free free the resources and makes cfg as NULL.
> > > Later unregister_netdev calls mdo_del_secy and finds cfg as NULL.
> > > Thanks for the review I will change the order and submit next version.
> > 
> > Leon, ack? Looks like the patches got "changes requested" but I see 
> > no other complaint.
> 
> Honestly, I was confused and didn't know what to answer, so decided to
> see next version.
> 
> From one side Subbaraya said that it is possible (which was not
> convincing to me, but ok, most time I'm wrong :)), from another
> he said that he will submit next version.

Jakub,

v2 is perfectly fine.

Thanks

> 
> Thanks