Re: [PATCH v6 08/22] bootconfig: init: Allow admin to use bootconfig for init command line

[Arvind Sankar]

On Tue, Aug 04, 2020 at 12:03:45AM +0900, Masami Hiramatsu wrote:
> On Sat, 1 Aug 2020 22:33:18 -0400
> Arvind Sankar <nivedita@xxxxxxxxxxxx> wrote:
> > 
> > I came across this as I was poking around some of the command line
> > parsing. AFAICT, initargs_found will never be set to true here, because
> > parse_args handles "--" itself by immediately returning: it doesn't
> > invoke the callback for it. So you'd instead have to check the return of
> > parse_args("bootconfig"...) to detect the initargs_found case.
> 
> Oops, good catch!
> Does this fixes the problem?

Note I found the issue by code inspection, I don't have an actual test
case. But the change looks good to me, with one comment below.

> 
>  	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
> -	parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
> -		   bootconfig_params);
> +	err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
> +			 bootconfig_params);
>  
> -	if (!bootconfig_found)
> +	if (IS_ERR(err) || !bootconfig_found)
>  		return;
>  
> +	/* parse_args() stops at '--' and returns an address */
> +	if (!IS_ERR(err) && err)
> +		initargs_found = true;
> +

I think you can drop the second IS_ERR, since we already checked that.

>  	if (!data) {
>  		pr_err("'bootconfig' found on command line, but no bootconfig found\n");
>  		return;
> -- 
> 2.25.1