[PATCH 19/20] staging: gasket: common ioctl dispatcher add __user annotations

[Todd Poynor]

From: Todd Poynor <toddpoy...@google.com>

Add __user annotation to gasket core common ioctl pointer arguments for
sparse checking.

Reported-by: Dmitry Torokhov <d...@chromium.org>
Signed-off-by: Zhongze Hu <fran...@chromium.org>
Signed-off-by: Todd Poynor <toddpoy...@google.com>
---
 drivers/staging/gasket/gasket_ioctl.c | 8 +++++---
 drivers/staging/gasket/gasket_ioctl.h | 4 +++-
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/gasket/gasket_ioctl.c 
b/drivers/staging/gasket/gasket_ioctl.c
index 8fd44979fe713..998d0e215523c 100644
--- a/drivers/staging/gasket/gasket_ioctl.c
+++ b/drivers/staging/gasket/gasket_ioctl.c
@@ -7,6 +7,7 @@
 #include "gasket_interrupt.h"
 #include "gasket_logging.h"
 #include "gasket_page_table.h"
+#include <linux/compiler.h>
 #include <linux/fs.h>
 #include <linux/uaccess.h>
 
@@ -39,13 +40,14 @@ static int gasket_config_coherent_allocator(
  * standard ioctl dispatch function.
  * @filp: File structure pointer describing this node usage session.
  * @cmd: ioctl number to handle.
- * @arg: ioctl-specific data pointer.
+ * @argp: ioctl-specific data pointer.
  *
  * Standard ioctl dispatcher; forwards operations to individual handlers.
  */
-long gasket_handle_ioctl(struct file *filp, uint cmd, ulong arg)
+long gasket_handle_ioctl(struct file *filp, uint cmd, void __user *argp)
 {
        struct gasket_dev *gasket_dev;
+       unsigned long arg = (unsigned long)argp;
        int retval;
 
        gasket_dev = (struct gasket_dev *)filp->private_data;
@@ -53,7 +55,7 @@ long gasket_handle_ioctl(struct file *filp, uint cmd, ulong 
arg)
 
        if (gasket_get_ioctl_permissions_cb(gasket_dev)) {
                retval = gasket_get_ioctl_permissions_cb(gasket_dev)(
-                       filp, cmd, arg);
+                       filp, cmd, argp);
                if (retval < 0) {
                        trace_gasket_ioctl_exit(-EPERM);
                        return retval;
diff --git a/drivers/staging/gasket/gasket_ioctl.h 
b/drivers/staging/gasket/gasket_ioctl.h
index 461fab27a3e52..51f468c77f041 100644
--- a/drivers/staging/gasket/gasket_ioctl.h
+++ b/drivers/staging/gasket/gasket_ioctl.h
@@ -5,6 +5,8 @@
 
 #include "gasket_core.h"
 
+#include <linux/compiler.h>
+
 /*
  * Handle Gasket common ioctls.
  * @filp: Pointer to the ioctl's file.
@@ -13,7 +15,7 @@
  *
  * Returns 0 on success and nonzero on failure.
  */
-long gasket_handle_ioctl(struct file *filp, uint cmd, ulong arg);
+long gasket_handle_ioctl(struct file *filp, uint cmd, void __user *argp);
 
 /*
  * Determines if an ioctl is part of the standard Gasket framework.
-- 
2.18.0.233.g985f88cf7e-goog