linux-kernel - Re: [PATCH 1/1] __init setup_early

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Date:	Mon, 27 Jan 2014 13:49:59 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	xypron.glpk@....de
Cc:	gxt@...c.pku.edu.cn, paul.gortmaker@...driver.com,
	vapier@...too.org, totglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] __init setup_early_printk: missing initialization

On Mon, 27 Jan 2014 19:10:24 +0100 xypron.glpk@....de wrote:

> From: Heinrich Schuchardt <xypron.glpk@....de>
> 
> If is based on uninitialized value keep_early.
> This leads to unpredictable result.
> 
> ...
>
> --- a/arch/unicore32/kernel/early_printk.c
> +++ b/arch/unicore32/kernel/early_printk.c
> @@ -35,7 +35,7 @@ static struct console early_ocd_console = {
>  
>  static int __init setup_early_printk(char *buf)
>  {
> -	int keep_early;
> +	int keep_early = 0;
>  
>  	if (!buf || early_console)
>  		return 0;

yup.

But that code is quite overcooked.  How about this?

--- a/arch/unicore32/kernel/early_printk.c~arch-unicore32-kernel-early_printkc-setup_early_printk-missing-initialization-fix
+++ a/arch/unicore32/kernel/early_printk.c
@@ -35,17 +35,11 @@ static struct console early_ocd_console
 
 static int __init setup_early_printk(char *buf)
 {
-	int keep_early = 0;
-
 	if (!buf || early_console)
 		return 0;
 
-	if (strstr(buf, "keep"))
-		keep_early = 1;
-
 	early_console = &early_ocd_console;
-
-	if (keep_early)
+	if (strstr(buf, "keep"))
 		early_console->flags &= ~CON_BOOT;
 	else
 		early_console->flags |= CON_BOOT;
_

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