linux-kernel - Re: [PATCH] mfd: tps6594: Add null pointer check to tps6594_device

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Message-ID: <12be2a40-0952-4577-80a0-fec688769230@kylinos.cn>
Date:   Fri, 8 Dec 2023 11:24:49 +0800
From:   Kunwu Chan <chentao@...inos.cn>
To:     Lee Jones <lee@...nel.org>
Cc:     jpanis@...libre.com, kunwu.chan@...mail.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: tps6594: Add null pointer check to
 tps6594_device_init

Thanks for your reply.
I'll update the v2 patch:
1. When 'tps6594_irq_chip.name' is null,just return -ENOMEM.

Thanks again,
Kunwu

On 2023/12/8 00:10, Lee Jones wrote:
> On Tue, 05 Dec 2023, Kunwu Chan wrote:
> 
>> devm_kasprintf() returns a pointer to dynamically allocated memory
>> which can be NULL upon failure.
>>
>> Fixes: 325bec7157b3 ("mfd: tps6594: Add driver for TI TPS6594 PMIC")
>> Signed-off-by: Kunwu Chan <chentao@...inos.cn>
>> ---
>>   drivers/mfd/tps6594-core.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/mfd/tps6594-core.c b/drivers/mfd/tps6594-core.c
>> index 0fb9c5cf213a..6403c1063de9 100644
>> --- a/drivers/mfd/tps6594-core.c
>> +++ b/drivers/mfd/tps6594-core.c
>> @@ -433,6 +433,9 @@ int tps6594_device_init(struct tps6594 *tps, bool enable_crc)
>>   	tps6594_irq_chip.name = devm_kasprintf(dev, GFP_KERNEL, "%s-%ld-0x%02x",
>>   					       dev->driver->name, tps->chip_id, tps->reg);
>>   
>> +	if (!tps6594_irq_chip.name)
>> +		return dev_err_probe(dev, -ENOMEM, "Failed to allocate memory\n");
>> +
> 
> The check is fine, but the use of dev_err_probe() is not.
> 
> Simply:
> 
> 	return -ENOMEM;
> 
>>   	ret = devm_regmap_add_irq_chip(dev, tps->regmap, tps->irq, IRQF_SHARED | IRQF_ONESHOT,
>>   				       0, &tps6594_irq_chip, &tps->irq_data);
>>   	if (ret)
>> -- 
>> 2.34.1
>>
>