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

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

[Ashish Kalra]

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@gmail.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 ed65ac57adbe..77e8d2913b76 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 70570e8a5ad2..dfb2d2832830 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;
 		}
 	}
-- 
2.30.2

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

[Greg Kroah-Hartman]

On Sat, May 01, 2021 at 05:09:28PM +0530, Ashish Kalra wrote:
> 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.

Please properly line-wrap your changelog comments.

Can you fix it up and resend it as v3?

thanks,

greg k-h

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

[Ashish]

On Sat, May 01, 2021 at 02:23:12PM +0200, Greg Kroah-Hartman wrote:
> On Sat, May 01, 2021 at 05:09:28PM +0530, Ashish Kalra wrote:
> > 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.
> 
> Please properly line-wrap your changelog comments.
> 
> Can you fix it up and resend it as v3?
> 
> thanks,
> 
> greg k-h
Thanks Greg for your feedback
Kindly ignore v3 and review v4, i have modified it as pe your feedback

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

[Ashish Kalra]

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@gmail.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

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

[Ashish Kalra]

Corrected data type for variable data adding __user to make it cleaner and silence the Sparse warning. This is version 2 of patch, version 1 can be found at https://lore.kernel.org/linux-staging/20210420090142.GA4086@ashish-NUC8i5BEH/

Signed-off-by: Ashish Kalra <eashishkalra@gmail.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

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

[Ashish Kalra]

Corrected data type for variable data adding __user to make it cleaner and silence the Sparse warning. This is version 2 of patch, version 1 can be found at https://lore.kernel.org/linux-staging/20210420090142.GA4086@ashish-NUC8i5BEH/

Signed-off-by: Ashish Kalra <eashishkalra@gmail.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

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

[Greg Kroah-Hartman]

On Tue, Apr 27, 2021 at 04:58:44PM +0000, Ashish Kalra wrote:
> Corrected data type for variable data adding __user to make it cleaner and silence the Sparse warning. This is version 2 of patch, version 1 can be found at https://lore.kernel.org/linux-staging/20210420090142.GA4086@ashish-NUC8i5BEH/
> 
> Signed-off-by: Ashish Kalra <eashishkalra@gmail.com>
> ---
> 
> Changes from v1: removed type casting of (void __user *) for req->data and corrected type for data to include __user

Did you send this twice?

And please wrap your changelog text and put proper information in it,
not references to previous patches.

thanks,

greg k-h

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

[ashish]

On Wed, Apr 28, 2021 at 08:02:31AM +0200, Greg Kroah-Hartman wrote:
> On Tue, Apr 27, 2021 at 04:58:44PM +0000, Ashish Kalra wrote:
> > Corrected data type for variable data adding __user to make it cleaner and silence the Sparse warning. This is version 2 of patch, version 1 can be found at https://lore.kernel.org/linux-staging/20210420090142.GA4086@ashish-NUC8i5BEH/
> > 
> > Signed-off-by: Ashish Kalra <eashishkalra@gmail.com>
> > ---
> > 
> > Changes from v1: removed type casting of (void __user *) for req->data and corrected type for data to include __user
> 
> Did you send this twice?
> 
> And please wrap your changelog text and put proper information in it,
> not references to previous patches.
> 
> thanks,
> 
> greg k-h
Thanks Greg
Sorry for sending twice due to some issue in To list
I have corrected and send again as per your inputs
hopefully it will be ok now