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uvc_v4l2: clean copyin/copyout up 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-12-29 16:25:30 -05:00
parent 14544d7690
commit 18e2ea5cd0
1 changed files with 22 additions and 33 deletions
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55
drivers/media/usb/uvc/uvc_v4l2.c
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@ -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;
}