src/http/ngx_http_upstream.c:2385: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_send_response`.

src/http/ngx_http_upstream.c:2232:1: Parameter `r->uri_changes`
2230. 
2231. 
2232. static void
      ^
2233. ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
2234. {

src/http/ngx_http_upstream.c:2381:9: Call
2379.     }
2380. 
2381.     if (ngx_http_upstream_process_headers(r, u) != NGX_OK) {
              ^
2382.         return;
2383.     }

src/http/ngx_http_upstream.c:2644:1: Parameter `r->uri_changes`
  2642. 
  2643. 
  2644. static ngx_int_t
        ^
  2645. ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2646. {

src/http/ngx_http_upstream.c:2385:5: Call
2383.     }
2384. 
2385.     ngx_http_upstream_send_response(r, u);
          ^
2386. }
2387. 

src/http/ngx_http_upstream.c:2832:1: Parameter `r->uri_changes`
  2830. 
  2831. 
  2832. static void
        ^
  2833. ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2834. {

src/http/ngx_http_upstream.c:3171:5: Call
  3169.     r->write_event_handler = ngx_http_upstream_process_downstream;
  3170. 
  3171.     ngx_http_upstream_process_upstream(r, u);
            ^
  3172. }
  3173. 

src/http/ngx_http_upstream.c:3816:1: Parameter `r->uri_changes`
    3814. 
    3815. 
    3816. static void
          ^
    3817. ngx_http_upstream_process_upstream(ngx_http_request_t *r,
    3818.     ngx_http_upstream_t *u)

src/http/ngx_http_upstream.c:3858:5: Call
    3856.     }
    3857. 
    3858.     ngx_http_upstream_process_request(r, u);
              ^
    3859. }
    3860. 

src/http/ngx_http_upstream.c:3862:1: Parameter `r->uri_changes`
      3860. 
      3861. 
      3862. static void
            ^
      3863. ngx_http_upstream_process_request(ngx_http_request_t *r,
      3864.     ngx_http_upstream_t *u)

src/http/ngx_http_upstream.c:3965:13: Call
      3963. 
      3964.         if (!u->cacheable && !u->store && u->peer.connection) {
      3965.             ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
                        ^
      3966.         }
      3967.     }

src/http/ngx_http_upstream.c:4224:1: Parameter `r->uri_changes`
        4222. 
        4223. 
        4224. static void
              ^
        4225. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
        4226.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:4235:9: Call
        4233.     if (u->cleanup == NULL) {
        4234.         /* the request was already finalized */
        4235.         ngx_http_finalize_request(r, NGX_DONE);
                      ^
        4236.         return;
        4237.     }

src/http/ngx_http_request.c:2307:1: Parameter `r->uri_changes`
          2305. 
          2306. 
          2307. void
                ^
          2308. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
          2309. {

src/http/ngx_http_request.c:2488:9: Call
          2486.     }
          2487. 
          2488.     if (ngx_http_post_action(r) == NGX_OK) {
                        ^
          2489.         return;
          2490.     }

src/http/ngx_http_request.c:3391:1: Parameter `r->uri_changes`
            3389. 
            3390. 
            3391. static ngx_int_t
                  ^
            3392. ngx_http_post_action(ngx_http_request_t *r)
            3393. {

src/http/ngx_http_request.c:3418:9: Call
            3416. 
            3417.     if (clcf->post_action.data[0] == '/') {
            3418.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                          ^
            3419. 
            3420.     } else {

src/http/ngx_http_core_module.c:2395:1: <LHS trace>
2393. 
2394. 
2395. ngx_int_t
      ^
2396. ngx_http_internal_redirect(ngx_http_request_t *r,
2397.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2395:1: Parameter `r->uri_changes`
              2393. 
              2394. 
              2395. ngx_int_t
                    ^
              2396. ngx_http_internal_redirect(ngx_http_request_t *r,
              2397.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2401:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_send_response` 
              2399.     ngx_http_core_srv_conf_t  *cscf;
              2400. 
              2401.     r->uri_changes--;
                        ^
              2402. 
              2403.     if (r->uri_changes == 0) {
