Re: [PATCH] drm/i2c: tda998x: Replace all non-returning strlcpy with strscpy

["Russell King (Oracle)" <linux@armlinux.org.uk>]

On Mon, May 22, 2023 at 03:53:50PM +0000, Azeem Shaikh wrote:
> strlcpy() reads the entire source buffer first.
> This read may exceed the destination size limit.
> This is both inefficient and can lead to linear read
> overflows if a source string is not NUL-terminated [1].
> In an effort to remove strlcpy() completely [2], replace
> strlcpy() here with strscpy().
> No return values were used, so direct replacement is safe.
...
>  	memset(&cec_info, 0, sizeof(cec_info));
> -	strlcpy(cec_info.type, "tda9950", sizeof(cec_info.type));
> +	strscpy(cec_info.type, "tda9950", sizeof(cec_info.type));

Please explain how:

1) a C string can not be NUL terminated.
2) this source string could be longer than I2C_NAME_SIZE (20 bytes)
   which is unlikely to ever shrink.

I'm not saying I disagree with the patch, but the boilerplate commit
message isn't correct for this change, and is actually misleading
for what the patch actually is.

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