linux-kernel - Re: [PATCH] bootconfig: Fix to initialize 'ret' local variable

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Message-ID: <20211027100126.58769bf9@gandalf.local.home>
Date:   Wed, 27 Oct 2021 10:01:26 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bootconfig: Fix to initialize 'ret' local variable

On Wed, 27 Oct 2021 22:54:28 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Fix xbc_parse_tree() to initialize the 'ret' local variable
> before referring in the loop.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Andrew Morton <akpm@...ux-foundation.org>
> Fixes: f3668cde8562 ("bootconfig: Split parse-tree part from xbc_init")
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>

Heh, I just sent the exact same thing. But you have the wrong fixes tag I
believe. As that change just moved the code, but the original location had
the same issue I believe.

I'm fine taking yours instead. But I'd like to update the text explaining
how the ret can be uninitialized and what happens if we set it to zero.

-- Steve


> ---
>  lib/bootconfig.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/bootconfig.c b/lib/bootconfig.c
> index a10ab25f6fcc..70e0d52ffd24 100644
> --- a/lib/bootconfig.c
> +++ b/lib/bootconfig.c
> @@ -836,7 +836,7 @@ static int __init xbc_verify_tree(void)
>  static int __init xbc_parse_tree(void)
>  {
>  	char *p, *q;
> -	int ret, c;
> +	int ret = 0, c;
>  
>  	last_parent = NULL;
>  	p = xbc_data;