vim-patch:9.0.2111: [security]: overflow in get_number

Problem:  [security]: overflow in get_number
Solution: Return 0 when the count gets too large

[security]: overflow in get_number

When using the z= command, we may overflow the count with values larger
than MAX_INT. So verify that we do not overflow and in case when an
overflow is detected, simply return 0

73b2d3790c

Co-authored-by: Christian Brabandt <cb@256bit.org>

src/nvim/input.c

@@ -180,6 +180,9 @@ int get_number(int colon, int *mouse_used)
     ui_cursor_goto(msg_row, msg_col);
     int c = safe_vgetc();
     if (ascii_isdigit(c)) {
+      if (n > INT_MAX / 10) {
+        return 0;
+      }
       n = n * 10 + c - '0';
       msg_putchar(c);
       typed++;