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

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Date:   Mon, 29 Aug 2022 22:56:54 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Kalle Valo <kvalo@...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

On Mon, Aug 29, 2022 at 07:20:10PM +0300, Kalle Valo wrote:
> 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?

Sorry for the delay. Just sent the PR to Greg for including it as a fix for
v6.0.

Thanks,
Mani

> 
> -- 
> https://patchwork.kernel.org/project/linux-wireless/list/
> 
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

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