linux-kernel - Re: [PATCH] irqchip/sifive-plic: Fix error handling of of_property_read_u32

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Date: Mon, 25 Mar 2024 21:45:59 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Qingfang Deng <dqfext@...il.com>, Thomas Gleixner <tglx@...utronix.de>,
 Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley
 <paul.walmsley@...ive.com>, Albert Ou <aou@...s.berkeley.edu>,
 Atish Patra <atishp@...shpatra.org>, linux-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org
Cc: Christoph Hellwig <hch@....de>,
 Qingfang Deng <qingfang.deng@...lower.com.cn>
Subject: Re: [PATCH] irqchip/sifive-plic: Fix error handling of
 of_property_read_u32

Hi Qingfang,

On 22/03/2024 18:08, Alexandre Ghiti wrote:
> Hi Qingfang,
>
> On 22/03/2024 10:00, Qingfang Deng wrote:
>> From: Qingfang Deng <qingfang.deng@...lower.com.cn>
>>
>> nr_irqs will not be initialized if of_property_read_u32 returns an
>> error. Check the error first.
>>
>> Fixes: 8237f8bc4f6e ("irqchip: add a SiFive PLIC driver")
>> Signed-off-by: Qingfang Deng <qingfang.deng@...lower.com.cn>
>> ---
>>   drivers/irqchip/irq-sifive-plic.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/irqchip/irq-sifive-plic.c 
>> b/drivers/irqchip/irq-sifive-plic.c
>> index 5b7bc4fd9517..f436b61d74b0 100644
>> --- a/drivers/irqchip/irq-sifive-plic.c
>> +++ b/drivers/irqchip/irq-sifive-plic.c
>> @@ -428,8 +428,11 @@ static int __init __plic_init(struct device_node 
>> *node,
>>           goto out_free_priv;
>>       }
>>   +    error = of_property_read_u32(node, "riscv,ndev", &nr_irqs);
>> +    if (error)
>> +        goto out_iounmap;
>> +
>>       error = -EINVAL;
>> -    of_property_read_u32(node, "riscv,ndev", &nr_irqs);
>>       if (WARN_ON(!nr_irqs))
>>           goto out_iounmap;
>

So this is actually already fixed in 6.9-rc1 by this commit: 
956521064780 ("irqchip/sifive-plic: Parse number of interrupts and 
contexts early in plic_probe()").

Thanks,

Alex

>
> You can add:
>
> Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
>
> Thanks,
>
> Alex
>
>
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> linux-riscv@...ts.infradead.org
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