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

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Message-ID: <20230426061654.GC27649@unreal>
Date:   Wed, 26 Apr 2023 09:16:54 +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 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.

Thanks