linux-kernel - [PATCH v4] wifi: rtw89: debug: Fix error handling in rtw89_debug_priv_btc_manual

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Message-ID: <tencent_1C09B99BD7DA9CAD18B00C8F0F050F540607@qq.com>
Date:   Sat, 15 Jul 2023 21:42:57 +0800
From:   Zhang Shurong <zhang_shurong@...mail.com>
To:     pkshih@...ltek.com, Markus.Elfring@....de, kuba@...nel.org
Cc:     kvalo@...nel.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Zhang Shurong <zhang_shurong@...mail.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@...mail.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