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

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Date:	Mon, 14 Jul 2014 18:30:01 +0200
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	"Li, Zhen-Hua" <zhen-hual@...com>,
	"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

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@....de>

Best regards

Heinrich


> -----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
>

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