[PATCH][next] wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl_s1

[PATCH][next] wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl_s1

[Colin Ian King]

Variables hw_ctrl_s1 and sw_ctrl_s1 are not being initialized and
potentially can contain any garbage value. Currently there is an if
statement that sets one or the other of these variables, followed
by an if statement that checks if any of these variables have been
set to a non-zero value. In the case where they may contain
uninitialized non-zero values, the latter if statement may be
taken as true when it was not expected to.

Fix this by ensuring hw_ctrl_s1 and sw_ctrl_s1 are initialized.

Cleans up clang warning:
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:7: warning:
variable 'hw_ctrl_s1' is used uninitialized whenever 'if' condition is
false [-Wsometimes-uninitialized]
                if (hw_ctrl) {
                    ^~~~~~~
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:440:7: note: uninitialized
use occurs here
                if (hw_ctrl_s1 || sw_ctrl_s1) {
                    ^~~~~~~~~~
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:3: note: remove the 'if'
if its condition is always true
                if (hw_ctrl) {
                ^~~~~~~~~~~~~

Fixes: c888183b21f3 ("wifi: rtl8xxxu: Support new chip RTL8188FU")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
---
 drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
index 99610bb2afd5..0025bb32538d 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
@@ -412,7 +412,7 @@ static void rtl8188f_spur_calibration(struct rtl8xxxu_priv *priv, u8 channel)
 	};
 
 	const u8 threshold = 0x16;
-	bool do_notch, hw_ctrl, sw_ctrl, hw_ctrl_s1, sw_ctrl_s1;
+	bool do_notch, hw_ctrl, sw_ctrl, hw_ctrl_s1 = 0, sw_ctrl_s1 = 0;
 	u32 val32, initial_gain, reg948;
 
 	val32 = rtl8xxxu_read32(priv, REG_OFDM0_RX_D_SYNC_PATH);
-- 
2.37.3

Re: [PATCH][next] wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl_s1

[Nathan Chancellor]

On Thu, Oct 20, 2022 at 02:57:09PM +0100, Colin Ian King wrote:
> Variables hw_ctrl_s1 and sw_ctrl_s1 are not being initialized and
> potentially can contain any garbage value. Currently there is an if
> statement that sets one or the other of these variables, followed
> by an if statement that checks if any of these variables have been
> set to a non-zero value. In the case where they may contain
> uninitialized non-zero values, the latter if statement may be
> taken as true when it was not expected to.
> 
> Fix this by ensuring hw_ctrl_s1 and sw_ctrl_s1 are initialized.
> 
> Cleans up clang warning:
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:7: warning:
> variable 'hw_ctrl_s1' is used uninitialized whenever 'if' condition is
> false [-Wsometimes-uninitialized]
>                 if (hw_ctrl) {
>                     ^~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:440:7: note: uninitialized
> use occurs here
>                 if (hw_ctrl_s1 || sw_ctrl_s1) {
>                     ^~~~~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:3: note: remove the 'if'
> if its condition is always true
>                 if (hw_ctrl) {
>                 ^~~~~~~~~~~~~
> 
> Fixes: c888183b21f3 ("wifi: rtl8xxxu: Support new chip RTL8188FU")
> Signed-off-by: Colin Ian King <colin.i.king@gmail.com>

I was getting ready to send a similar patch.

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

> ---
>  drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
> index 99610bb2afd5..0025bb32538d 100644
> --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
> +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
> @@ -412,7 +412,7 @@ static void rtl8188f_spur_calibration(struct rtl8xxxu_priv *priv, u8 channel)
>  	};
>  
>  	const u8 threshold = 0x16;
> -	bool do_notch, hw_ctrl, sw_ctrl, hw_ctrl_s1, sw_ctrl_s1;
> +	bool do_notch, hw_ctrl, sw_ctrl, hw_ctrl_s1 = 0, sw_ctrl_s1 = 0;
>  	u32 val32, initial_gain, reg948;
>  
>  	val32 = rtl8xxxu_read32(priv, REG_OFDM0_RX_D_SYNC_PATH);
> -- 
> 2.37.3
> 
> 

Re: [PATCH][next] wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl_s1

[Kalle Valo]

Colin Ian King <colin.i.king@gmail.com> writes:

> Variables hw_ctrl_s1 and sw_ctrl_s1 are not being initialized and
> potentially can contain any garbage value. Currently there is an if
> statement that sets one or the other of these variables, followed
> by an if statement that checks if any of these variables have been
> set to a non-zero value. In the case where they may contain
> uninitialized non-zero values, the latter if statement may be
> taken as true when it was not expected to.
>
> Fix this by ensuring hw_ctrl_s1 and sw_ctrl_s1 are initialized.
>
> Cleans up clang warning:
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:7: warning:
> variable 'hw_ctrl_s1' is used uninitialized whenever 'if' condition is
> false [-Wsometimes-uninitialized]
>                 if (hw_ctrl) {
>                     ^~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:440:7: note: uninitialized
> use occurs here
>                 if (hw_ctrl_s1 || sw_ctrl_s1) {
>                     ^~~~~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:3: note: remove the 'if'
> if its condition is always true
>                 if (hw_ctrl) {
>                 ^~~~~~~~~~~~~
>
> Fixes: c888183b21f3 ("wifi: rtl8xxxu: Support new chip RTL8188FU")
> Signed-off-by: Colin Ian King <colin.i.king@gmail.com>

I'll queue this to v6.1.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH][next] wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl_s1

[Kalle Valo]

Kalle Valo <kvalo@kernel.org> writes:

> Colin Ian King <colin.i.king@gmail.com> writes:
>
>> Variables hw_ctrl_s1 and sw_ctrl_s1 are not being initialized and
>> potentially can contain any garbage value. Currently there is an if
>> statement that sets one or the other of these variables, followed
>> by an if statement that checks if any of these variables have been
>> set to a non-zero value. In the case where they may contain
>> uninitialized non-zero values, the latter if statement may be
>> taken as true when it was not expected to.
>>
>> Fix this by ensuring hw_ctrl_s1 and sw_ctrl_s1 are initialized.
>>
>> Cleans up clang warning:
>> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:7: warning:
>> variable 'hw_ctrl_s1' is used uninitialized whenever 'if' condition is
>> false [-Wsometimes-uninitialized]
>>                 if (hw_ctrl) {
>>                     ^~~~~~~
>> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:440:7: note: uninitialized
>> use occurs here
>>                 if (hw_ctrl_s1 || sw_ctrl_s1) {
>>                     ^~~~~~~~~~
>> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:3: note: remove the 'if'
>> if its condition is always true
>>                 if (hw_ctrl) {
>>                 ^~~~~~~~~~~~~
>>
>> Fixes: c888183b21f3 ("wifi: rtl8xxxu: Support new chip RTL8188FU")
>> Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
>
> I'll queue this to v6.1.

Actually commit c888183b21f3 is in wireless-next so this patch should go
to wireless-next, for v6.2.

-- 
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https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH][next] wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl_s1

[Kalle Valo]

Colin Ian King <colin.i.king@gmail.com> wrote:

> Variables hw_ctrl_s1 and sw_ctrl_s1 are not being initialized and
> potentially can contain any garbage value. Currently there is an if
> statement that sets one or the other of these variables, followed
> by an if statement that checks if any of these variables have been
> set to a non-zero value. In the case where they may contain
> uninitialized non-zero values, the latter if statement may be
> taken as true when it was not expected to.
> 
> Fix this by ensuring hw_ctrl_s1 and sw_ctrl_s1 are initialized.
> 
> Cleans up clang warning:
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:7: warning:
> variable 'hw_ctrl_s1' is used uninitialized whenever 'if' condition is
> false [-Wsometimes-uninitialized]
>                 if (hw_ctrl) {
>                     ^~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:440:7: note: uninitialized
> use occurs here
>                 if (hw_ctrl_s1 || sw_ctrl_s1) {
>                     ^~~~~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:3: note: remove the 'if'
> if its condition is always true
>                 if (hw_ctrl) {
>                 ^~~~~~~~~~~~~
> 
> Fixes: c888183b21f3 ("wifi: rtl8xxxu: Support new chip RTL8188FU")
> Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
> Reviewed-by: Nathan Chancellor <nathan@kernel.org>

Patch applied to wireless-next.git, thanks.

80e5acb6dd72 wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl_s1

-- 
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https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches