netdev - RE: [PATCH net,v3] net: mana: Fix accessing freed irq affinity

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Date:   Tue, 7 Feb 2023 15:39:31 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Paul Rosswurm <paulros@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "leon@...nel.org" <leon@...nel.org>,
        Long Li <longli@...rosoft.com>,
        "ssengar@...ux.microsoft.com" <ssengar@...ux.microsoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH net,v3] net: mana: Fix accessing freed irq affinity_hint



> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Monday, February 6, 2023 9:33 PM
> To: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: linux-hyperv@...r.kernel.org; netdev@...r.kernel.org; Dexuan Cui
> <decui@...rosoft.com>; KY Srinivasan <kys@...rosoft.com>; Paul Rosswurm
> <paulros@...rosoft.com>; olaf@...fle.de; vkuznets@...hat.com;
> davem@...emloft.net; wei.liu@...nel.org; edumazet@...gle.com;
> pabeni@...hat.com; leon@...nel.org; Long Li <longli@...rosoft.com>;
> ssengar@...ux.microsoft.com; linux-kernel@...r.kernel.org;
> stable@...r.kernel.org
> Subject: Re: [PATCH net,v3] net: mana: Fix accessing freed irq affinity_hint
> 
> On Mon,  6 Feb 2023 13:28:49 -0800 Haiyang Zhang wrote:
> > After calling irq_set_affinity_and_hint(), the cpumask pointer is
> > saved in desc->affinity_hint, and will be used later when reading
> > /proc/irq/<num>/affinity_hint. So the cpumask variable needs to be
> > persistent. Otherwise, we are accessing freed memory when reading
> > the affinity_hint file.
> >
> > Also, need to clear affinity_hint before free_irq(), otherwise there
> > is a one-time warning and stack trace during module unloading:
> 
> What's the difference from the previous posting? Did you just resend it?

Previously, it failed the auto-check due to some people were not CC-ed.
I resent it with more CCs.

Thanks,
- Haiyang