linux-kernel - Re: [PATCH] staging: rtl8723au: os_dep: usb_intf.c: Fix for possible null pointer dereference

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Message-ID: <CAFo99gZOr=1z8J_gNNRLXnKNBEiPCE_G3=ryaN5hAHvewHf0_w@mail.gmail.com>
Date:	Tue, 16 Dec 2014 00:01:20 +0100
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Jes Sorensen <Jes.Sorensen@...hat.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Larry Finger <Larry.Finger@...inger.net>,
	devel@...verdev.osuosl.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: rtl8723au: os_dep: usb_intf.c: Fix for possible
 null pointer dereference

Hi

No the rtw_hw_resume23a() is not used anywhere.
I also do a check of all functions that are not used, but not in the
drivers/staging, I suspected that these might be under development and
used in the future.

What do you want to do, who decides?


Kind regards
Rickard Strandqvist


2014-12-15 16:48 GMT+01:00 Jes Sorensen <Jes.Sorensen@...hat.com>:
> Dan Carpenter <dan.carpenter@...cle.com> writes:
>> On Sun, Dec 14, 2014 at 11:39:14PM +0100, Rickard Strandqvist wrote:
>>> There is otherwise a risk of a possible null pointer dereference.
>>>
>>> Was largely found by using a static code analysis program called cppcheck.
>>>
>>> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
>>> ---
>>>  drivers/staging/rtl8723au/os_dep/usb_intf.c |    3 ++-
>>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/staging/rtl8723au/os_dep/usb_intf.c
>>> b/drivers/staging/rtl8723au/os_dep/usb_intf.c
>>> index 865743e..71a6330 100644
>>> --- a/drivers/staging/rtl8723au/os_dep/usb_intf.c
>>> +++ b/drivers/staging/rtl8723au/os_dep/usb_intf.c
>>> @@ -351,10 +351,11 @@ error_exit:
>>>  int rtw_hw_resume23a(struct rtw_adapter *padapter)
>>
>> That's weird.  Is this function even called?
>
> [jes@...rasam jes.git]$ find drivers/staging/rtl8723au -name \*.[ch] |xargs grep rtw_hw_resume
> drivers/staging/rtl8723au/include/osdep_intf.h:int rtw_hw_resume23a(struct rtw_adapter *padapter);
> drivers/staging/rtl8723au/os_dep/usb_intf.c:int rtw_hw_resume23a(struct rtw_adapter *padapter)
> drivers/staging/rtl8723au/os_dep/usb_intf.c:            DBG_8723A("==> rtw_hw_resume23a\n");
> [jes@...rasam jes.git]$ find drivers/staging/rtl8723au -name \*.[ch] |xargs grep rtw_hw_suspend
> drivers/staging/rtl8723au/include/osdep_intf.h:int rtw_hw_suspend23a(struct rtw_adapter *padapter);
> drivers/staging/rtl8723au/os_dep/usb_intf.c:int rtw_hw_suspend23a(struct rtw_adapter *padapter)
> drivers/staging/rtl8723au/os_dep/usb_intf.c:            DBG_8723A("==> rtw_hw_suspend23a\n");
>
> A more useful patch would be one removing those two functions IMHO.
>
> Jes
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