[PATCH] staging: r8723au: Add missing initialization of change_inx in sort algorithm

[PATCH] staging: r8723au: Add missing initialization of change_inx in sort algorithm

[Geert Uytterhoeven]

drivers/staging/rtl8723au/core/rtw_wlan_util.c: In function ‘WMMOnAssocRsp23a’:
drivers/staging/rtl8723au/core/rtw_wlan_util.c:684: warning: ‘change_inx’ may be used uninitialized in this function

Depending on the uninitialized data on the stack, the array may not be
sorted correctly.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
 drivers/staging/rtl8723au/core/rtw_wlan_util.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8723au/core/rtw_wlan_util.c b/drivers/staging/rtl8723au/core/rtw_wlan_util.c
index 0dfcfbce3b52..a4361bb93865 100644
--- a/drivers/staging/rtl8723au/core/rtw_wlan_util.c
+++ b/drivers/staging/rtl8723au/core/rtw_wlan_util.c
@@ -681,7 +681,7 @@ void WMMOnAssocRsp23a(struct rtw_adapter *padapter)
 	inx[0] = 0; inx[1] = 1; inx[2] = 2; inx[3] = 3;
 
 	if (pregpriv->wifi_spec == 1) {
-		u32	j, tmp, change_inx;
+		u32	j, tmp, change_inx = false;
 
 		/* entry indx: 0->vo, 1->vi, 2->be, 3->bk. */
 		for (i = 0; i < 4; i++) {
-- 
1.7.9.5

Re: [PATCH] staging: r8723au: Add missing initialization of change_inx in sort algorithm

[Larry Finger]

On 04/10/2014 12:46 PM, Geert Uytterhoeven wrote:
> drivers/staging/rtl8723au/core/rtw_wlan_util.c: In function ‘WMMOnAssocRsp23a’:
> drivers/staging/rtl8723au/core/rtw_wlan_util.c:684: warning: ‘change_inx’ may be used uninitialized in this function
>
> Depending on the uninitialized data on the stack, the array may not be
> sorted correctly.
>
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> ---

Acked-by: Larry Finger <Larry.Finger@lwfinger.net>

Geert,

Thanks for this. I wonder why my gcc on x86_64 did not flag this problem.

Larry

>   drivers/staging/rtl8723au/core/rtw_wlan_util.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/rtl8723au/core/rtw_wlan_util.c b/drivers/staging/rtl8723au/core/rtw_wlan_util.c
> index 0dfcfbce3b52..a4361bb93865 100644
> --- a/drivers/staging/rtl8723au/core/rtw_wlan_util.c
> +++ b/drivers/staging/rtl8723au/core/rtw_wlan_util.c
> @@ -681,7 +681,7 @@ void WMMOnAssocRsp23a(struct rtw_adapter *padapter)
>   	inx[0] = 0; inx[1] = 1; inx[2] = 2; inx[3] = 3;
>
>   	if (pregpriv->wifi_spec == 1) {
> -		u32	j, tmp, change_inx;
> +		u32	j, tmp, change_inx = false;
>
>   		/* entry indx: 0->vo, 1->vi, 2->be, 3->bk. */
>   		for (i = 0; i < 4; i++) {
>

Re: [PATCH] staging: r8723au: Add missing initialization of change_inx in sort algorithm

[Geert Uytterhoeven]

Hi Larry,

On Thu, Apr 10, 2014 at 8:01 PM, Larry Finger <Larry.Finger@lwfinger.net> wrote:
> On 04/10/2014 12:46 PM, Geert Uytterhoeven wrote:
>>
>> drivers/staging/rtl8723au/core/rtw_wlan_util.c: In function
>> ‘WMMOnAssocRsp23a’:
>> drivers/staging/rtl8723au/core/rtw_wlan_util.c:684: warning: ‘change_inx’
>> may be used uninitialized in this function
>>
>> Depending on the uninitialized data on the stack, the array may not be
>> sorted correctly.
>>
>> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
>> ---
>
> Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
>
> Geert,
>
> Thanks for this. I wonder why my gcc on x86_64 did not flag this problem.

Because it's too new?

Several warnings were disabled in more recent versions of gcc (still
using 4.1.2 for m68k here ;-) due to too many false positives.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds