linux-kernel - Re: [PATCH] ipmi: ssif: replace strlcpy with strscpy

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Message-ID: <20211222140110.GU14936@minyard.net>
Date:   Wed, 22 Dec 2021 08:01:10 -0600
From:   Corey Minyard <minyard@....org>
To:     Jason Wang <wangborong@...rlc.com>
Cc:     openipmi-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipmi: ssif: replace strlcpy with strscpy

On Wed, Dec 22, 2021 at 11:27:07AM +0800, Jason Wang wrote:
> The strlcpy should not be used because it doesn't limit the source
> length. So that it will lead some potential bugs.
> 
> But the strscpy doesn't require reading memory from the src string
> beyond the specified "count" bytes, and since the return value is
> easier to error-check than strlcpy()'s. In addition, the implementation
> is robust to the string changing out from underneath it, unlike the
> current strlcpy() implementation.
> 
> Thus, replace strlcpy with strscpy.

Ok, thanks for the patch.

-corey

> 
> Signed-off-by: Jason Wang <wangborong@...rlc.com>
> ---
>  drivers/char/ipmi/ipmi_ssif.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
> index 48aab77abebf..ba779f1abb5b 100644
> --- a/drivers/char/ipmi/ipmi_ssif.c
> +++ b/drivers/char/ipmi/ipmi_ssif.c
> @@ -1354,7 +1354,7 @@ static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
>  	if (rv)
>  		rv = -ENODEV;
>  	else
> -		strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
> +		strscpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
>  	kfree(resp);
>  	return rv;
>  }
> -- 
> 2.34.1
>