vt: drop access_ok() calls in unimap ioctls

Done by copy_{from,to}_user().

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/vt/vt_ioctl.c

@@ -266,10 +266,6 @@ do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_
 
 	if (copy_from_user(&tmp, user_ud, sizeof tmp))
 		return -EFAULT;
-	if (tmp.entries)
-		if (!access_ok(VERIFY_WRITE, tmp.entries,
-				tmp.entry_ct*sizeof(struct unipair)))
-			return -EFAULT;
 	switch (cmd) {
 	case PIO_UNIMAP:
 		if (!perm)
@@ -1170,10 +1166,6 @@ compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
 	if (copy_from_user(&tmp, user_ud, sizeof tmp))
 		return -EFAULT;
 	tmp_entries = compat_ptr(tmp.entries);
-	if (tmp_entries)
-		if (!access_ok(VERIFY_WRITE, tmp_entries,
-				tmp.entry_ct*sizeof(struct unipair)))
-			return -EFAULT;
 	switch (cmd) {
 	case PIO_UNIMAP:
 		if (!perm)