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

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Message-ID: <a066097a-b02e-eee0-c57a-27dd7fbe6989@codethink.co.uk>
Date:   Tue, 11 Jul 2023 10:36:49 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     nvdimm@...ts.linux.dev
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        lenb@...nel.org
Subject: Re: [PATCH] ACPI: NFIT: limit string attribute write

On 11/07/2023 10:22, Ben Dooks wrote:
> If we're writing what could be an arbitrary sized string into an attribute
> we should probably use sysfs_emit() 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>
> ---
> v2:
>    - use sysfs_emit() instead of snprintf.
> ---
>   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);
>   }
>   static DEVICE_ATTR_RO(id);
>   

whoops, forgot to add before hitting ammend...

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

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