linux-kernel - Re: [PATCH net, 2/2] net: mana: Fix accessing freed irq affinity

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Message-ID: <Y9Y97pNR/jeOy1jA@unreal>
Date:   Sun, 29 Jan 2023 11:35:42 +0200
From:   Leon Romanovsky <leon@...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,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH net, 2/2] net: mana: Fix accessing freed irq affinity_hint

On Thu, Jan 26, 2023 at 01:04:45PM -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
> allocated per irq, and available until freeing the irq. Otherwise,
> we are accessing freed memory when reading the affinity_hint file.
> 
> To fix the bug, allocate the cpumask per irq, and free it just
> before freeing the irq.
> 
> Cc: stable@...r.kernel.org
> Fixes: 71fa6887eeca ("net: mana: Assign interrupts to CPUs based on NUMA nodes")
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> ---
>  .../net/ethernet/microsoft/mana/gdma_main.c   | 40 ++++++++++---------
>  include/net/mana/gdma.h                       |  1 +
>  2 files changed, 23 insertions(+), 18 deletions(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>