src/http/ngx_http_request.c:1602: error: Integer Overflow L2
  ([0, `len`] - 1):unsigned64.

src/http/ngx_http_request.c:1561:1: <LHS trace>
1559. 
1560. 
1561. static ssize_t
      ^
1562. ngx_http_validate_host(u_char *host, size_t len)
1563. {

src/http/ngx_http_request.c:1561:1: Parameter `len`
1559. 
1560. 
1561. static ssize_t
      ^
1562. ngx_http_validate_host(u_char *host, size_t len)
1563. {

src/http/ngx_http_request.c:1568:5: Assignment
1566.     ngx_uint_t  dot;
1567. 
1568.     last = len;
          ^
1569.     dot = 0;
1570. 

src/http/ngx_http_request.c:1602:9: Binary operation: ([0, len] - 1):unsigned64
1600. 
1601.     if (dot) {
1602.         last--;
              ^
1603.     }
1604. 
