uvc_v4l2: clean copyin/copyout up
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 3e7e283..329a967 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1284,36 +1284,30 @@ struct uvc_xu_control_mapping32 {
static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
const struct uvc_xu_control_mapping32 __user *up)
{
- compat_caddr_t p;
+ struct uvc_xu_control_mapping32 *p = (void *)kp;
+ compat_caddr_t info;
+ u32 count;
- if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
- __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
- __get_user(kp->menu_count, &up->menu_count))
+ if (copy_from_user(p, up, sizeof(*p)))
return -EFAULT;
+ count = p->menu_count;
+ info = p->menu_info;
+
memset(kp->reserved, 0, sizeof(kp->reserved));
-
- if (kp->menu_count == 0) {
- kp->menu_info = NULL;
- return 0;
- }
-
- if (__get_user(p, &up->menu_info))
- return -EFAULT;
- kp->menu_info = compat_ptr(p);
-
+ kp->menu_info = count ? compat_ptr(info) : NULL;
+ kp->menu_count = count;
return 0;
}
static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
struct uvc_xu_control_mapping32 __user *up)
{
- if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
- __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
- __put_user(kp->menu_count, &up->menu_count))
+ if (copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
+ put_user(kp->menu_count, &up->menu_count))
return -EFAULT;
- if (__clear_user(up->reserved, sizeof(up->reserved)))
+ if (clear_user(up->reserved, sizeof(up->reserved)))
return -EFAULT;
return 0;
@@ -1330,31 +1324,26 @@ struct uvc_xu_control_query32 {
static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
const struct uvc_xu_control_query32 __user *up)
{
- compat_caddr_t p;
+ struct uvc_xu_control_query32 v;
- if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
- __copy_from_user(kp, up, offsetof(typeof(*up), data)))
+ if (copy_from_user(&v, up, sizeof(v)))
return -EFAULT;
- if (kp->size == 0) {
- kp->data = NULL;
- return 0;
- }
-
- if (__get_user(p, &up->data))
- return -EFAULT;
- kp->data = compat_ptr(p);
-
+ *kp = (struct uvc_xu_control_query){
+ .unit = v.unit,
+ .selector = v.selector,
+ .query = v.query,
+ .size = v.size,
+ .data = v.size ? compat_ptr(v.data) : NULL
+ };
return 0;
}
static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
struct uvc_xu_control_query32 __user *up)
{
- if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
- __copy_to_user(up, kp, offsetof(typeof(*up), data)))
+ if (copy_to_user(up, kp, offsetof(typeof(*up), data)))
return -EFAULT;
-
return 0;
}