linux-kernel - Re: [PATCH v13 2/6] x86/boot: Introduce get_acpi_rsdp() to parse RSDP in cmdline from KEXEC

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Date:   Thu, 13 Dec 2018 20:29:50 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Masayoshi Mizuma <msys.mizuma@...il.com>
Cc:     Chao Fan <fanc.fnst@...fujitsu.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, keescook@...omium.org, bhe@...hat.com,
        indou.takao@...fujitsu.com, caoj.fnst@...fujitsu.com
Subject: Re: [PATCH v13 2/6] x86/boot: Introduce get_acpi_rsdp() to parse
 RSDP in cmdline from KEXEC

On Thu, Dec 13, 2018 at 02:25:30PM -0500, Masayoshi Mizuma wrote:
> > +	len = cmdline_find_option("acpi_rsdp", val, MAX_ADDRESS_LENGTH+1);
> 
> sizeof() is better here.
> 
> 	len = cmdline_find_option("acpi_rsdp", val, sizeof(var));

Why is it better?

That makes you go look for the "val" variable and see what it's size is.
MAX_ADDRESS_LENGTH+1 is OTOH explicit.

> 
> > +	if (len > 0) {
> > +		val[len] = 0;
> 
> '\0' should be fine here not 0.
> 
> 		val[len] = '\0';

Yes.

-- 
Regards/Gruss,
    Boris.

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