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

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Date:   Sun, 19 Feb 2023 13:20:22 +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 2/9/23 1:49 PM, Thomas Gleixner 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? :-/
> 
> Obviously :)
> 
> /me goes to find trash tongs to pick it up

   Need help? :-)

MBR, Sergey