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

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Message-ID: <53C4EC23.4060309@hp.com>
Date:	Tue, 15 Jul 2014 16:53:55 +0800
From:	"Li, ZhenHua" <zhen-hual@...com>
To:	Heinrich Schuchardt <xypron.glpk@....de>
CC:	"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

Heinrich,
Thank you very much for reviewing. But seems the maintainer will not 
accept it.

Zhenhua

On 07/15/2014 12:30 AM, Heinrich Schuchardt wrote:
> 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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