linux-kernel - Re: [PATCH net] lib: cpu_rmap: Fix potential use-after-free in irq_cpu_rmap

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Date:   Tue, 6 Jun 2023 10:18:16 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Ben Hutchings <ben@...adent.org.uk>
Cc:     netdev@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, Eli Cohen <elic@...dia.com>
Subject: Re: [PATCH net] lib: cpu_rmap: Fix potential use-after-free in
 irq_cpu_rmap_release()

On Fri, Jun 02, 2023 at 08:28:15PM +0200, Ben Hutchings wrote:
> irq_cpu_rmap_release() calls cpu_rmap_put(), which may free the rmap.
> So we need to clear the pointer to our glue structure in rmap before
> doing that, not after.
> 
> Fixes: 4e0473f1060a ("lib: cpu_rmap: Avoid use after free on rmap->obj ...")
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>

Reviewed-by: Simon Horman <simon.horman@...igine.com>