Re: [PATCH] keys: Remove return variable and length check to simplify user_read

[Jarkko Sakkinen <jarkko@kernel.org>]

On Sat, Feb 28, 2026 at 10:44:46AM +0100, Thorsten Blum wrote:
> In user_read(), remove the unnecessary return variable 'ret' and return
> ->datalen directly. Drop the redundant 'buflen > 0' check and use min()
> to determine the number of bytes to copy.  No functional changes.
> 
> Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>

Trivial cleanup commits with no function are not feasible. They only do
harm e.g., for backporting actual bug fixes.

> ---
>  security/keys/user_defined.c | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
> index 6f88b507f927..b53e063272c2 100644
> --- a/security/keys/user_defined.c
> +++ b/security/keys/user_defined.c
> @@ -171,20 +171,14 @@ EXPORT_SYMBOL_GPL(user_describe);
>  long user_read(const struct key *key, char *buffer, size_t buflen)
>  {
>  	const struct user_key_payload *upayload;
> -	long ret;
>  
>  	upayload = user_key_payload_locked(key);
> -	ret = upayload->datalen;
>  
>  	/* we can return the data as is */
> -	if (buffer && buflen > 0) {
> -		if (buflen > upayload->datalen)
> -			buflen = upayload->datalen;
> +	if (buffer)
> +		memcpy(buffer, upayload->data, min(buflen, upayload->datalen));
>  
> -		memcpy(buffer, upayload->data, buflen);
> -	}
> -
> -	return ret;
> +	return upayload->datalen;
>  }
>  
>  EXPORT_SYMBOL_GPL(user_read);
> -- 
> Thorsten Blum <thorsten.blum@linux.dev>
> GPG: 1D60 735E 8AEF 3BE4 73B6  9D84 7336 78FD 8DFE EAD4
> 

BR, Jarkko