src/http/ngx_http_upstream.c:1986: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_send_response`.

src/http/ngx_http_upstream.c:1840:1: Parameter `r->uri_changes`
1838. 
1839. 
1840. static void
      ^
1841. ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
1842. {

src/http/ngx_http_upstream.c:1981:9: Call
1979.     }
1980. 
1981.     if (ngx_http_upstream_process_headers(r, u) != NGX_OK) {
              ^
1982.         return;
1983.     }

src/http/ngx_http_upstream.c:2245:1: Parameter `r->uri_changes`
  2243. 
  2244. 
  2245. static ngx_int_t
        ^
  2246. ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2247. {

src/http/ngx_http_upstream.c:1986:9: Call
1984. 
1985.     if (!r->subrequest_in_memory) {
1986.         ngx_http_upstream_send_response(r, u);
              ^
1987.         return;
1988.     }

src/http/ngx_http_upstream.c:2464:1: Parameter `r->uri_changes`
  2462. 
  2463. 
  2464. static void
        ^
  2465. ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2466. {

src/http/ngx_http_upstream.c:2477:9: Call
  2475. 
  2476.     if (rc == NGX_ERROR || rc > NGX_OK || r->post_action) {
  2477.         ngx_http_upstream_finalize_request(r, u, rc);
                ^
  2478.         return;
  2479.     }

src/http/ngx_http_upstream.c:3744:1: Parameter `r->uri_changes`
    3742. 
    3743. 
    3744. static void
          ^
    3745. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
    3746.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:3756:9: Call
    3754.     if (u->cleanup == NULL) {
    3755.         /* the request was already finalized */
    3756.         ngx_http_finalize_request(r, NGX_DONE);
                  ^
    3757.         return;
    3758.     }

src/http/ngx_http_request.c:2249:1: Parameter `r->uri_changes`
      2247. 
      2248. 
      2249. void
            ^
      2250. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
      2251. {

src/http/ngx_http_request.c:2416:9: Call
      2414.     }
      2415. 
      2416.     if (ngx_http_post_action(r) == NGX_OK) {
                    ^
      2417.         return;
      2418.     }

src/http/ngx_http_request.c:3340:1: Parameter `r->uri_changes`
        3338. 
        3339. 
        3340. static ngx_int_t
              ^
        3341. ngx_http_post_action(ngx_http_request_t *r)
        3342. {

src/http/ngx_http_request.c:3367:9: Call
        3365. 
        3366.     if (clcf->post_action.data[0] == '/') {
        3367.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                      ^
        3368. 
        3369.     } else {

src/http/ngx_http_core_module.c:2581:1: <LHS trace>
2579. 
2580. 
2581. ngx_int_t
      ^
2582. ngx_http_internal_redirect(ngx_http_request_t *r,
2583.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2581:1: Parameter `r->uri_changes`
          2579. 
          2580. 
          2581. ngx_int_t
                ^
          2582. ngx_http_internal_redirect(ngx_http_request_t *r,
          2583.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2587:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_send_response` 
          2585.     ngx_http_core_srv_conf_t  *cscf;
          2586. 
          2587.     r->uri_changes--;
                    ^
          2588. 
          2589.     if (r->uri_changes == 0) {
