linux-kernel - RE: [PATCH 1/1] script/kconfig: remove a warning for menucofig

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Message-ID: <1267BB84A242B24E81E0C0C8955CFFC061A30C1D@G9W0343.americas.hpqcorp.net>
Date:	Mon, 30 Jun 2014 23:10:32 +0000
From:	"Li, Zhen-Hua" <zhen-hual@...com>
To:	Heinrich Schuchardt <xypron.glpk@....de>,
	"Yann E. MORIN" <yann.morin.1998@...e.fr>,
	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] script/kconfig: remove a warning for menucofig

When malloc for jump, 
if (head && location) {
	jump = xmalloc(sizeof(struct jump_key));
	....
}
And here it is used:
if (head && location && menu == location)
	jump->offset = strlen(r->s);


So I think when jump is used, it must not be NULL; then !=NULL is not needed.
-----Original Message-----
From: Heinrich Schuchardt [mailto:xypron.glpk@....de] 
Sent: Tuesday, July 01, 2014 1:03 AM
To: Li, Zhen-Hua; Yann E. MORIN; linux-kbuild@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] script/kconfig: remove a warning for menucofig

On 30.06.2014 05:16, Li, Zhen-Hua wrote:
> There is a warning when run "make menuconfig".
>
> scripts/kconfig/menu.c: In function ‘get_symbol_str’:
> scripts/kconfig/menu.c:591:18: warning: ‘jump’ may be used uninitialized in
> this function [-Wmaybe-uninitialized]
>       jump->offset = strlen(r->s);
>                    ^
> scripts/kconfig/menu.c:551:19: note: ‘jump’ was declared here
>    struct jump_key *jump;
>                     ^
>
> It is because the compiler think "jump" is not initialized, though in fact
> it is already initialized.
>
> Signed-off-by: Li, Zhen-Hua <zhen-hual@...com>
> ---
>   scripts/kconfig/menu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
> index a26cc5d..584e0fc 100644
> --- a/scripts/kconfig/menu.c
> +++ b/scripts/kconfig/menu.c
> @@ -548,7 +548,7 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
>   {
>   	int i, j;
>   	struct menu *submenu[8], *menu, *location = NULL;
> -	struct jump_key *jump;
> +	struct jump_key *jump = NULL;
>
>   	str_printf(r, _("Prompt: %s\n"), _(prop->text));
>   	menu = prop->menu->parent;
>
Hello Zhen-Hua,

the patch looks incomplete to me. A check
jump != NULL
should be added before accessing parts of structure jump_key.

Best regards

Heinrich Schuchardt