Re: [PATCH 1/1] script/kconfig: remove a warning for menucofig

[Heinrich Schuchardt]

On 01.07.2014 01:10, Li, Zhen-Hua wrote:
> 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.

I tested the patch against v13.6-rc5. It fixes the problem with the warning.

You can add

Reviewed-by: Heinrich Schuchardt <xypron.glpk@xxxxxx>

Best regards

Heinrich


> -----Original Message-----
> From: Heinrich Schuchardt [mailto:xypron.glpk@xxxxxx]
> Sent: Tuesday, July 01, 2014 1:03 AM
> To: Li, Zhen-Hua; Yann E. MORIN; linux-kbuild@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> 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 âget_symbol_strâ:
> > scripts/kconfig/menu.c:591:18: warning: âjumpâ may be used uninitialized in
> > this function [-Wmaybe-uninitialized]
> >        jump->offset = strlen(r->s);
> >                     ^
> > scripts/kconfig/menu.c:551:19: note: âjumpâ 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@xxxxxx>
> > ---
> >    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

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