linux-kernel - Re: [PATCH] drm/msm/dpu: Add callback function pointer check before its call

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Date: Wed, 10 Apr 2024 14:48:41 +0300
From: Aleksandr Mishin <amishin@...rgos.ru>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: Rob Clark <robdclark@...il.com>, Abhinav Kumar
	<quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, Marijn Suijten
	<marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, Daniel
 Vetter <daniel@...ll.ch>, Neil Armstrong <neil.armstrong@...aro.org>, Stephen
 Boyd <swboyd@...omium.org>, <linux-arm-msm@...r.kernel.org>,
	<dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>, <lvc-project@...uxtesting.org>
Subject: Re: [PATCH] drm/msm/dpu: Add callback function pointer check before
 its call



On 08.04.2024 12:03, Dmitry Baryshkov wrote:
> On Mon, 8 Apr 2024 at 11:57, Aleksandr Mishin <amishin@...rgos.ru> wrote:
>>
>> In dpu_core_irq_callback_handler() callback function pointer is compared to NULL,
>> but then callback function is unconditionally called by this pointer.
>> Fix this bug by adding conditional return.
>>
>> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> This should be converted to a proper Reported-by: trailer.
> 

It is an established practice for our project, you can find 700+ applied
patches with similar line:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=linuxtesting.org

>>
>> Fixes: c929ac60b3ed ("drm/msm/dpu: allow just single IRQ callback")
>> Signed-off-by: Aleksandr Mishin <amishin@...rgos.ru>
>> ---
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
>> index 946dd0135dff..03a16fbd4c99 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
>> @@ -223,9 +223,11 @@ static void dpu_core_irq_callback_handler(struct dpu_kms *dpu_kms, unsigned int
>>
>>          VERB("IRQ=[%d, %d]\n", DPU_IRQ_REG(irq_idx), DPU_IRQ_BIT(irq_idx));
>>
>> -       if (!irq_entry->cb)
>> +       if (!irq_entry->cb) {
>>                  DRM_ERROR("no registered cb, IRQ=[%d, %d]\n",
>>                            DPU_IRQ_REG(irq_idx), DPU_IRQ_BIT(irq_idx));
>> +               return;
>> +       }
>>
>>          atomic_inc(&irq_entry->count);
>>
>> --
>> 2.30.2
>>
>>
> 
> 

-- 
Kind regards
Aleksandr