linux-kernel - [PATCH v2] staging: wlan-ng: silence incorrect type in argument 1 (different address spaces)

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Date:   Tue, 27 Apr 2021 18:03:10 +0000
From:   Ashish Kalra <eashishkalra@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ashish Kalra <eashishkalra@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v2] staging: wlan-ng: silence incorrect type in argument 1
 (different address spaces)

Currently p80211knetdev_do_ioctl use type casting to req->data to prevent sparse warning while 
calling memdup_user, instead of type casting it here, its better to change data type for data 
inside p80211ioctl_req to include __user.

Signed-off-by: Ashish Kalra <eashishkalra@...il.com>
---

Changes from v1: 
removed type casting of (void __user *) for req->data and corrected type for data to include __user.

 drivers/staging/wlan-ng/p80211ioctl.h  | 2 +-
 drivers/staging/wlan-ng/p80211netdev.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/wlan-ng/p80211ioctl.h b/drivers/staging/wlan-ng/p80211ioctl.h
index ed65ac57a..77e8d2913 100644
--- a/drivers/staging/wlan-ng/p80211ioctl.h
+++ b/drivers/staging/wlan-ng/p80211ioctl.h
@@ -81,7 +81,7 @@
 
 struct p80211ioctl_req {
 	char name[WLAN_DEVNAMELEN_MAX];
-	caddr_t data;
+	char __user *data;
 	u32 magic;
 	u16 len;
 	u32 result;
diff --git a/drivers/staging/wlan-ng/p80211netdev.c b/drivers/staging/wlan-ng/p80211netdev.c
index 70570e8a5..dfb2d2832 100644
--- a/drivers/staging/wlan-ng/p80211netdev.c
+++ b/drivers/staging/wlan-ng/p80211netdev.c
@@ -569,7 +569,7 @@ static int p80211knetdev_do_ioctl(struct net_device *dev,
 		goto bail;
 	}
 
-	msgbuf = memdup_user((void __user *)req->data, req->len);
+	msgbuf = memdup_user(req->data, req->len);
 	if (IS_ERR(msgbuf)) {
 		result = PTR_ERR(msgbuf);
 		goto bail;
@@ -579,7 +579,7 @@ static int p80211knetdev_do_ioctl(struct net_device *dev,
 
 	if (result == 0) {
 		if (copy_to_user
-		    ((void __user *)req->data, msgbuf, req->len)) {
+		    (req->data, msgbuf, req->len)) {
 			result = -EFAULT;
 		}
 	}
-- 
2.25.1