linux-kernel - Re: [PATCH] ACPI: NFIT: limit string attribute write

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Message-ID: <c49505f7-6756-5184-6a1a-044a278b7f60@codethink.co.uk>
Date:   Tue, 11 Jul 2023 09:36:39 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Dave Jiang <dave.jiang@...el.com>, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org
Cc:     nvdimm@...ts.linux.dev, lenb@...nel.org
Subject: Re: [PATCH] ACPI: NFIT: limit string attribute write

On 05/07/2023 19:34, Dave Jiang wrote:
> 
> 
> On 7/4/23 01:17, Ben Dooks wrote:
>> If we're writing what could be an arbitrary sized string into an 
>> attribute
>> we should probably use snprintf() just to be safe. Most of the other
>> attriubtes are some sort of integer so unlikely to be an issue so not
>> altered at this time.
>>
>> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
>> ---
>>   drivers/acpi/nfit/core.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
>> index 9213b426b125..d7e9d9cd16d2 100644
>> --- a/drivers/acpi/nfit/core.c
>> +++ b/drivers/acpi/nfit/core.c
>> @@ -1579,7 +1579,7 @@ static ssize_t id_show(struct device *dev,
>>   {
>>       struct nfit_mem *nfit_mem = to_nfit_mem(dev);
>> -    return sprintf(buf, "%s\n", nfit_mem->id);
>> +    return snprintf(buf, PAGE_SIZE, "%s\n", nfit_mem->id);
> 
> Why not just convert it to sysfs_emit()?

I'll look into that.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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