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

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Message-ID: <20230206183303.35fd1cf7@kernel.org>
Date:   Mon, 6 Feb 2023 18:33:03 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Haiyang Zhang <haiyangz@...rosoft.com>
Cc:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        decui@...rosoft.com, kys@...rosoft.com, 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, 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?