linux-kernel - [PATCH 07/10] wifi: rtw88: fix incorrect error codes in rtw_debugfs_set_rf

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Message-ID: <tencent_0AA8A35A4948DED8D5826DDD83F179A4290A@qq.com>
Date:   Sat, 22 Apr 2023 18:04:51 +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 07/10] wifi: rtw88: fix incorrect error codes in rtw_debugfs_set_rf_read

If there is a failure during copy_from_user or user-provided data
buffer is invalid, rtw_debugfs_set_rf_read 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 | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/debug.c b/drivers/net/wireless/realtek/rtw88/debug.c
index 259e6c15bc78..e033077d49b0 100644
--- a/drivers/net/wireless/realtek/rtw88/debug.c
+++ b/drivers/net/wireless/realtek/rtw88/debug.c
@@ -456,14 +456,17 @@ static ssize_t rtw_debugfs_set_rf_read(struct file *filp,
 	char tmp[32 + 1];
 	u32 path, addr, mask;
 	int num;
+	int ret;
 
-	rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 3);
+	ret = rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 3);
+	if (ret < 0)
+		return ret;
 
 	num = sscanf(tmp, "%x %x %x", &path, &addr, &mask);
 
 	if (num !=  3) {
 		rtw_warn(rtwdev, "invalid args, [path] [addr] [mask] [val]\n");
-		return count;
+		return -EINVAL;
 	}
 
 	debugfs_priv->rf_path = path;
-- 
2.40.0