linux-kernel - Re: [PATCH v3 1/1] bus: mhi: host: Fix up null pointer access in mhi_irq

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Message-ID: <87h71vc98l.fsf@kernel.org>
Date:   Mon, 29 Aug 2022 19:20:10 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Manivannan Sadhasivam <mani@...nel.org>
Cc:     Qiang Yu <quic_qianyu@...cinc.com>, quic_hemantk@...cinc.com,
        loic.poulain@...aro.org, quic_jhugo@...cinc.com,
        mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_cang@...cinc.com,
        ath11k@...ts.infradead.org
Subject: Re: [PATCH v3 1/1] bus: mhi: host: Fix up null pointer access in mhi_irq_handler

Manivannan Sadhasivam <mani@...nel.org> writes:

> On Tue, Jul 26, 2022 at 08:53:58PM +0300, Kalle Valo wrote:
>> Manivannan Sadhasivam <mani@...nel.org> writes:
>> 
>> > +ath11k, Kalle
>> >
>> > On Fri, Jul 22, 2022 at 11:17:18AM +0800, Qiang Yu wrote:
>> >> The irq handler for a shared IRQ ought to be prepared for running
>> >> even now it's being freed. So let's check the pointer used by
>> >> mhi_irq_handler to avoid null pointer access since it is probably
>> >> released before freeing IRQ.
>> >> 
>> >> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
>> >
>> > Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
>> 
>> This fixes the crash and my regression tests pass now, thanks. But
>> please see my question below.
>> 
>> Tested-by: Kalle Valo <kvalo@...nel.org>
>> 
>
> Thanks Kalle!

I just tested v6.0-rc3 and it's still crashing. What's the plan to get
this fix to Linus?

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