diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
index 58013698635f..8c685b501404 100644
--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -898,11 +898,13 @@ int vt_ioctl(struct tty_struct *tty,
 		if (arg > MAX_NR_CONSOLES)
 			return -ENXIO;
 
-		if (arg == 0)
+		if (arg == 0) {
 			vt_disallocate_all();
-		else
-			return vt_disallocate(--arg);
-		break;
+			break;
+		}
+
+		arg = array_index_nospec(arg - 1, MAX_NR_CONSOLES);
+		return vt_disallocate(arg);
 
 	case VT_RESIZE:
 	{