netdev - Re: [patch net-next v2 1/7] devlink: don't use strcpy() to copy param value

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Date:   Fri, 10 Feb 2023 11:33:47 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Jiri Pirko <jiri@...nulli.us>, <netdev@...r.kernel.org>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <edumazet@...gle.com>, <tariqt@...dia.com>, <saeedm@...dia.com>,
        <gal@...dia.com>, <kim.phillips@....com>, <moshe@...dia.com>,
        <simon.horman@...igine.com>, <idosch@...dia.com>
Subject: Re: [patch net-next v2 1/7] devlink: don't use strcpy() to copy param
 value



On 2/10/2023 2:01 AM, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...dia.com>
> 
> No need to treat string params any different comparing to other types.
> Rely on the struct assign to copy the whole struct, including the
> string.

I suspect the strcpy came from thinking about it as if it stored a
pointer to the string and not as an array struct member.

Makes sense.

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>

> 
> Signed-off-by: Jiri Pirko <jiri@...dia.com>
> Reviewed-by: Simon Horman <simon.horman@...igine.com>
> Acked-by: Jakub Kicinski <kuba@...nel.org>
> ---
>  net/devlink/leftover.c | 15 +++------------
>  1 file changed, 3 insertions(+), 12 deletions(-)
> 
> diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
> index f05ab093d231..f2f6a2f42864 100644
> --- a/net/devlink/leftover.c
> +++ b/net/devlink/leftover.c
> @@ -4388,10 +4388,7 @@ static int __devlink_nl_cmd_param_set_doit(struct devlink *devlink,
>  		return -EOPNOTSUPP;
>  
>  	if (cmode == DEVLINK_PARAM_CMODE_DRIVERINIT) {
> -		if (param->type == DEVLINK_PARAM_TYPE_STRING)
> -			strcpy(param_item->driverinit_value.vstr, value.vstr);
> -		else
> -			param_item->driverinit_value = value;
> +		param_item->driverinit_value = value;
>  		param_item->driverinit_value_valid = true;
>  	} else {
>  		if (!param->set)
> @@ -9656,10 +9653,7 @@ int devl_param_driverinit_value_get(struct devlink *devlink, u32 param_id,
>  						      DEVLINK_PARAM_CMODE_DRIVERINIT)))
>  		return -EOPNOTSUPP;
>  
> -	if (param_item->param->type == DEVLINK_PARAM_TYPE_STRING)
> -		strcpy(init_val->vstr, param_item->driverinit_value.vstr);
> -	else
> -		*init_val = param_item->driverinit_value;
> +	*init_val = param_item->driverinit_value;
>  
>  	return 0;
>  }
> @@ -9690,10 +9684,7 @@ void devl_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
>  						      DEVLINK_PARAM_CMODE_DRIVERINIT)))
>  		return;
>  
> -	if (param_item->param->type == DEVLINK_PARAM_TYPE_STRING)
> -		strcpy(param_item->driverinit_value.vstr, init_val.vstr);
> -	else
> -		param_item->driverinit_value = init_val;
> +	param_item->driverinit_value = init_val;
>  	param_item->driverinit_value_valid = true;
>  
>  	devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_NEW);