src/http/ngx_http_upstream.c:2336: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_send_response`.

src/http/ngx_http_upstream.c:2192:1: Parameter `r->uri_changes`
2190. 
2191. 
2192. static void
      ^
2193. ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
2194. {

src/http/ngx_http_upstream.c:2332:9: Call
2330.     }
2331. 
2332.     if (ngx_http_upstream_process_headers(r, u) != NGX_OK) {
              ^
2333.         return;
2334.     }

src/http/ngx_http_upstream.c:2595:1: Parameter `r->uri_changes`
  2593. 
  2594. 
  2595. static ngx_int_t
        ^
  2596. ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2597. {

src/http/ngx_http_upstream.c:2336:5: Call
2334.     }
2335. 
2336.     ngx_http_upstream_send_response(r, u);
          ^
2337. }
2338. 

src/http/ngx_http_upstream.c:2738:1: Parameter `r->uri_changes`
  2736. 
  2737. 
  2738. static void
        ^
  2739. ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2740. {

src/http/ngx_http_upstream.c:2775:13: Call
  2773. 
  2774.         if (!u->buffering) {
  2775.             ngx_http_upstream_finalize_request(r, u, rc);
                    ^
  2776.             return;
  2777.         }

src/http/ngx_http_upstream.c:4130:1: Parameter `r->uri_changes`
    4128. 
    4129. 
    4130. static void
          ^
    4131. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
    4132.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:4141:9: Call
    4139.     if (u->cleanup == NULL) {
    4140.         /* the request was already finalized */
    4141.         ngx_http_finalize_request(r, NGX_DONE);
                  ^
    4142.         return;
    4143.     }

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) {
