src/http/ngx_http_upstream.c:1864: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_send_response`.

src/http/ngx_http_upstream.c:1723:1: Parameter `r->uri_changes`
1721. 
1722. 
1723. static void
      ^
1724. ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
1725. {

src/http/ngx_http_upstream.c:1859:9: Call
1857.     }
1858. 
1859.     if (ngx_http_upstream_process_headers(r, u) != NGX_OK) {
              ^
1860.         return;
1861.     }

src/http/ngx_http_upstream.c:2123:1: Parameter `r->uri_changes`
  2121. 
  2122. 
  2123. static ngx_int_t
        ^
  2124. ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2125. {

src/http/ngx_http_upstream.c:1864:9: Call
1862. 
1863.     if (!r->subrequest_in_memory) {
1864.         ngx_http_upstream_send_response(r, u);
              ^
1865.         return;
1866.     }

src/http/ngx_http_upstream.c:2322:1: Parameter `r->uri_changes`
  2320. 
  2321. 
  2322. static void
        ^
  2323. ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2324. {

src/http/ngx_http_upstream.c:2422:13: Call
  2420.             }
  2421. 
  2422.             ngx_http_upstream_process_non_buffered_downstream(r);
                    ^
  2423. 
  2424.         } else {

src/http/ngx_http_upstream.c:2902:1: Parameter `r->uri_changes`
    2900. 
    2901. 
    2902. static void
          ^
    2903. ngx_http_upstream_process_non_buffered_downstream(ngx_http_request_t *r)
    2904. {

src/http/ngx_http_upstream.c:2925:5: Call
    2923.     }
    2924. 
    2925.     ngx_http_upstream_process_non_buffered_request(r, 1);
              ^
    2926. }
    2927. 

src/http/ngx_http_upstream.c:2952:1: Parameter `r->uri_changes`
      2950. 
      2951. 
      2952. static void
            ^
      2953. ngx_http_upstream_process_non_buffered_request(ngx_http_request_t *r,
      2954.     ngx_uint_t do_write)

src/http/ngx_http_upstream.c:2993:21: Call
      2991.                     || (upstream->read->eof && u->length == -1))
      2992.                 {
      2993.                     ngx_http_upstream_finalize_request(r, u, 0);
                                ^
      2994.                     return;
      2995.                 }

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:3663:9: Call
        3661.         || rc == NGX_HTTP_CLIENT_CLOSED_REQUEST)
        3662.     {
        3663.         ngx_http_finalize_request(r, rc);
                      ^
        3664.         return;
        3665.     }

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_send_response` 
              2565.     ngx_http_core_srv_conf_t  *cscf;
              2566. 
              2567.     r->uri_changes--;
                        ^
              2568. 
              2569.     if (r->uri_changes == 0) {
