Staging: heci: fix userspace pointer mess

Fix userspace pointer mess.
 - In memcmp(), dest and src pointer should be both in kernel space.
 - Add (void __user *) modification before userspace pointer.
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/heci/heci_main.c

@@ -1140,9 +1140,12 @@ static ssize_t heci_write(struct file *file, const char __user *ubuf,
 	spin_lock(&file_ext->file_lock);
 	file_ext->sm_state = 0;
 	if ((length == 4) &&
-	    ((memcmp(heci_wd_state_independence_msg[0], ubuf, 4) == 0) ||
-	     (memcmp(heci_wd_state_independence_msg[1], ubuf, 4) == 0) ||
-	     (memcmp(heci_wd_state_independence_msg[2], ubuf, 4) == 0)))
+	    ((memcmp(heci_wd_state_independence_msg[0],
+				 priv_write_cb->request_buffer.data, 4) == 0) ||
+	     (memcmp(heci_wd_state_independence_msg[1],
+				 priv_write_cb->request_buffer.data, 4) == 0) ||
+	     (memcmp(heci_wd_state_independence_msg[2],
+				 priv_write_cb->request_buffer.data, 4) == 0)))
 		file_ext->sm_state |= HECI_WD_STATE_INDEPENDENCE_MSG_SENT;
 	spin_unlock(&file_ext->file_lock);
 

drivers/staging/heci/io_heci.c

@@ -111,7 +111,7 @@ int heci_ioctl_get_version(struct iamt_heci_device *dev, int if_num,
 
 	rets = file_ext->status;
 	/* now copy the data to user space */
-	if (copy_to_user(k_msg.data, res_msg.data, res_msg.size)) {
+	if (copy_to_user((void __user *)k_msg.data, res_msg.data, res_msg.size)) {
 		rets = -EFAULT;
 		goto end;
 	}
@@ -188,7 +188,7 @@ int heci_ioctl_connect_client(struct iamt_heci_device *dev, int if_num,
 	/* copy the message to kernel space -
 	 * use a pointer already copied into kernel space
 	 */
-	if (copy_from_user(req_msg.data, k_msg.data, k_msg.size)) {
+	if (copy_from_user(req_msg.data, (void __user *)k_msg.data, k_msg.size)) {
 		rets = -EFAULT;
 		goto end;
 	}
@@ -266,7 +266,8 @@ int heci_ioctl_connect_client(struct iamt_heci_device *dev, int if_num,
 		spin_unlock_bh(&dev->device_lock);
 
 		/* now copy the data to user space */
-		if (copy_to_user(k_msg.data, res_msg.data, res_msg.size)) {
+		if (copy_to_user((void __user *)k_msg.data,
+					res_msg.data, res_msg.size)) {
 			rets = -EFAULT;
 			goto end;
 		}
@@ -320,7 +321,8 @@ int heci_ioctl_connect_client(struct iamt_heci_device *dev, int if_num,
 		DBG("successfully connected to FW client.\n");
 		rets = file_ext->status;
 		/* now copy the data to user space */
-		if (copy_to_user(k_msg.data, res_msg.data, res_msg.size)) {
+		if (copy_to_user((void __user *)k_msg.data,
+					res_msg.data, res_msg.size)) {
 			rets = -EFAULT;
 			goto end;
 		}
@@ -394,7 +396,8 @@ int heci_ioctl_wd(struct iamt_heci_device *dev, int if_num,
 	/* copy the message to kernel space - use a pointer already
 	 * copied into kernel space
 	 */
-	if (copy_from_user(req_msg.data, k_msg.data, req_msg.size)) {
+	if (copy_from_user(req_msg.data,
+				(void __user *)k_msg.data, req_msg.size)) {
 		rets = -EFAULT;
 		goto end;
 	}
@@ -464,7 +467,7 @@ int heci_ioctl_bypass_wd(struct iamt_heci_device *dev, int if_num,
 		return -EMSGSIZE;
 	}
 	spin_unlock(&file_ext->file_lock);
-	if (copy_from_user(&flag, k_msg.data, 1)) {
+	if (copy_from_user(&flag, (void __user *)k_msg.data, 1)) {
 		rets = -EFAULT;
 		goto end;
 	}