src/http/ngx_http_upstream.c:565: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request`.

src/http/ngx_http_upstream.c:479:1: Parameter `r->uri_changes`
477. 
478. 
479. static void
     ^
480. ngx_http_upstream_init_request(ngx_http_request_t *r)
481. {

src/http/ngx_http_upstream.c:565:13: Call
563.         u->state = ngx_array_push(r->upstream_states);
564.         if (u->state == NULL) {
565.             ngx_http_upstream_finalize_request(r, u,
                 ^
566.                                                NGX_HTTP_INTERNAL_SERVER_ERROR);
567.             return;

src/http/ngx_http_upstream.c:3536:1: Parameter `r->uri_changes`
  3534. 
  3535. 
  3536. static void
        ^
  3537. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
  3538.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:3675:9: Call
  3673. 
  3674.     if (r->header_only) {
  3675.         ngx_http_finalize_request(r, rc);
                ^
  3676.         return;
  3677.     }

src/http/ngx_http_request.c:2251:1: Parameter `r->uri_changes`
    2249. 
    2250. 
    2251. void
          ^
    2252. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
    2253. {

src/http/ngx_http_request.c:2418:9: Call
    2416.     }
    2417. 
    2418.     if (ngx_http_post_action(r) == NGX_OK) {
                  ^
    2419.         return;
    2420.     }

src/http/ngx_http_request.c:3336:1: Parameter `r->uri_changes`
      3334. 
      3335. 
      3336. static ngx_int_t
            ^
      3337. ngx_http_post_action(ngx_http_request_t *r)
      3338. {

src/http/ngx_http_request.c:3363:9: Call
      3361. 
      3362.     if (clcf->post_action.data[0] == '/') {
      3363.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                    ^
      3364. 
      3365.     } else {

src/http/ngx_http_core_module.c:2561:1: <LHS trace>
2559. 
2560. 
2561. ngx_int_t
      ^
2562. ngx_http_internal_redirect(ngx_http_request_t *r,
2563.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2561:1: Parameter `r->uri_changes`
        2559. 
        2560. 
        2561. ngx_int_t
              ^
        2562. ngx_http_internal_redirect(ngx_http_request_t *r,
        2563.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2567:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_finalize_request` 
        2565.     ngx_http_core_srv_conf_t  *cscf;
        2566. 
        2567.     r->uri_changes--;
                  ^
        2568. 
        2569.     if (r->uri_changes == 0) {
