linux-kernel - [PATCH 04/10] wifi: rtw88: fix incorrect error codes in rtw_debugfs_set_single

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Message-ID: <tencent_4D24DA6FF46A2DB766C0483DD0143A51F309@qq.com>
Date:   Sat, 22 Apr 2023 18:04:48 +0800
From:   Zhang Shurong <zhang_shurong@...mail.com>
To:     tony0620emma@...il.com
Cc:     kvalo@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhang Shurong <zhang_shurong@...mail.com>
Subject: [PATCH 04/10] wifi: rtw88: fix incorrect error codes in rtw_debugfs_set_single_input

If there is a failure during copy_from_user, rtw_debugfs_set_single_input
should return negative error code instead of a positive value count.

Fix this bug by returning correct error code.

Signed-off-by: Zhang Shurong <zhang_shurong@...mail.com>
---
 drivers/net/wireless/realtek/rtw88/debug.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtw88/debug.c b/drivers/net/wireless/realtek/rtw88/debug.c
index d8e872ae4dda..f721205185cf 100644
--- a/drivers/net/wireless/realtek/rtw88/debug.c
+++ b/drivers/net/wireless/realtek/rtw88/debug.c
@@ -320,8 +320,11 @@ static ssize_t rtw_debugfs_set_single_input(struct file *filp,
 	char tmp[32 + 1];
 	u32 input;
 	int num;
+	int ret;
 
-	rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 1);
+	ret = rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 1);
+	if (ret < 0)
+		return ret;
 
 	num = kstrtoint(tmp, 0, &input);
 
-- 
2.40.0