If there is a failure during kstrtobool_from_user()
rtw89_debug_priv_btc_manual_set should return a negative error code
instead of returning the count directly.

Fix this bug by returning an error code instead of a count after 
a failed call of the function "kstrtobool_from_user". Moreover
I omitted the label "out" with this source code correction.

Fixes: e3ec7017f6a2 ("rtw89: add Realtek 802.11ax driver")
Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
---
Changes in v2:
- Corrected the format of this patch
- Used variable ret instead of goto out
Changes in v3:
- Improved change description
Changes in v4:
- Improved change description

 drivers/net/wireless/realtek/rtw89/debug.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/debug.c b/drivers/net/wireless/realtek/rtw89/debug.c
index a4bbac916e22..ce5a9ac08145 100644
--- a/drivers/net/wireless/realtek/rtw89/debug.c
+++ b/drivers/net/wireless/realtek/rtw89/debug.c
@@ -3193,12 +3193,14 @@ static ssize_t rtw89_debug_priv_btc_manual_set(struct file *filp,
 	struct rtw89_dev *rtwdev = debugfs_priv->rtwdev;
 	struct rtw89_btc *btc = &rtwdev->btc;
 	bool btc_manual;
+	int ret;
 
-	if (kstrtobool_from_user(user_buf, count, &btc_manual))
-		goto out;
+	ret = kstrtobool_from_user(user_buf, count, &btc_manual);
+	if (ret)
+		return ret;
 
 	btc->ctrl.manual = btc_manual;
-out:
+
 	return count;
 }
 
-- 
2.30.2

Zhang Shurong <zhang_shurong@foxmail.com> wrote:

> If there is a failure during kstrtobool_from_user()
> rtw89_debug_priv_btc_manual_set should return a negative error code
> instead of returning the count directly.
> 
> Fix this bug by returning an error code instead of a count after 
> a failed call of the function "kstrtobool_from_user". Moreover
> I omitted the label "out" with this source code correction.
> 
> Fixes: e3ec7017f6a2 ("rtw89: add Realtek 802.11ax driver")
> Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
> Acked-by: Ping-Ke Shih <pkshih@realtek.com>

Patch applied to wireless-next.git, thanks.

59b4cc439f18 wifi: rtw89: debug: Fix error handling in rtw89_debug_priv_btc_manual_set()

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/tencent_1C09B99BD7DA9CAD18B00C8F0F050F540607@qq.com/

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

> -----Original Message-----
> From: Zhang Shurong <zhang_shurong@foxmail.com>
> Sent: Saturday, July 15, 2023 9:43 PM
> To: Ping-Ke Shih <pkshih@realtek.com>; Markus.Elfring@web.de; kuba@kernel.org
> Cc: kvalo@kernel.org; linux-wireless@vger.kernel.org; linux-kernel@vger.kernel.org; Zhang Shurong
> <zhang_shurong@foxmail.com>
> Subject: [PATCH v4] wifi: rtw89: debug: Fix error handling in rtw89_debug_priv_btc_manual_set()
> 
> If there is a failure during kstrtobool_from_user()
> rtw89_debug_priv_btc_manual_set should return a negative error code
> instead of returning the count directly.
> 
> Fix this bug by returning an error code instead of a count after
> a failed call of the function "kstrtobool_from_user". Moreover
> I omitted the label "out" with this source code correction.
> 
> Fixes: e3ec7017f6a2 ("rtw89: add Realtek 802.11ax driver")
> Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>

Acked-by: Ping-Ke Shih <pkshih@realtek.com>

> ---
> Changes in v2:
> - Corrected the format of this patch
> - Used variable ret instead of goto out
> Changes in v3:
> - Improved change description
> Changes in v4:
> - Improved change description
> 

Normally, we preserve three '-' as delimiter here. I tried to use pwclient to 
apply this patch, and fortunately it works. So, I think no need to resend because
of this.

[...]