linux-kernel - Re: [PATCH] irq: ipi: fix NULL pointer deref in irq_data_get_affinity

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Message-ID: <774e2812-2856-f146-b8b3-e4f772c5e38a@omp.ru>
Date:   Wed, 8 Feb 2023 21:35:28 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Thomas Gleixner <tglx@...utronix.de>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] irq: ipi: fix NULL pointer deref in
 irq_data_get_affinity_mask()

On 8/17/22 11:00 PM, Sergey Shtylyov wrote:

> Iff ipi_send_{mask|single}() get called with e.g. an invalid IRQ #, all the
> local variables there will be NULL -- the problem is that ipi_send_verify()
> (that's called first thing) doesn't verify its 'data' parameter, resulting
> in a kernel oops in irq_data_get_affinity_mask() as the passed NULL pointer
> gets dereferenced.  Add a missing NULL check in ipi_send_verify()...
> 
> Found by Linux Verification Center (linuxtesting.org) with the SVACE static
> analysis tool.
> 
> Fixes: 3b8e29a82dd1 ("genirq: Implement ipi_send_mask/single()")
> Signed-off-by: Sergey Shtylyov <s.shtylyov@....ru>

   Patch fell thru the cracks? :-/

MBR, Sergey