src/http/ngx_http_upstream.c:1709: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_process_body_in_memory`.

src/http/ngx_http_upstream.c:1527:1: Parameter `r->uri_changes`
1525. 
1526. 
1527. static void
      ^
1528. ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
1529. {

src/http/ngx_http_upstream.c:1667:9: Call
1665.     }
1666. 
1667.     if (ngx_http_upstream_process_headers(r, u) != NGX_OK) {
              ^
1668.         return;
1669.     }

src/http/ngx_http_upstream.c:1881:1: Parameter `r->uri_changes`
  1879. 
  1880. 
  1881. static ngx_int_t
        ^
  1882. ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u)
  1883. {

src/http/ngx_http_upstream.c:1709:5: Call
1707.     u->read_event_handler = ngx_http_upstream_process_body_in_memory;
1708. 
1709.     ngx_http_upstream_process_body_in_memory(r, u);
          ^
1710. }
1711. 

src/http/ngx_http_upstream.c:2003:1: Parameter `r->uri_changes`
  2001. 
  2002. 
  2003. static void
        ^
  2004. ngx_http_upstream_process_body_in_memory(ngx_http_request_t *r,
  2005.     ngx_http_upstream_t *u)

src/http/ngx_http_upstream.c:2021:9: Call
  2019.     if (rev->timedout) {
  2020.         ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out");
  2021.         ngx_http_upstream_finalize_request(r, u, NGX_HTTP_GATEWAY_TIME_OUT);
                ^
  2022.         return;
  2023.     }

src/http/ngx_http_upstream.c:3269:1: Parameter `r->uri_changes`
    3267. 
    3268. 
    3269. static void
          ^
    3270. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
    3271.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:3402:5: Call
    3400.     }
    3401. 
    3402.     ngx_http_finalize_request(r, rc);
              ^
    3403. }
    3404. 

src/http/ngx_http_request.c:2198:1: Parameter `r->uri_changes`
      2196. 
      2197. 
      2198. void
            ^
      2199. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
      2200. {

src/http/ngx_http_request.c:2236:13: Call
      2234.         || c->error)
      2235.     {
      2236.         if (ngx_http_post_action(r) == NGX_OK) {
                        ^
      2237.             return;
      2238.         }

src/http/ngx_http_request.c:3256:1: Parameter `r->uri_changes`
        3254. 
        3255. 
        3256. static ngx_int_t
              ^
        3257. ngx_http_post_action(ngx_http_request_t *r)
        3258. {

src/http/ngx_http_request.c:3283:9: Call
        3281. 
        3282.     if (clcf->post_action.data[0] == '/') {
        3283.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                      ^
        3284. 
        3285.     } else {

src/http/ngx_http_core_module.c:2551:1: <LHS trace>
2549. 
2550. 
2551. ngx_int_t
      ^
2552. ngx_http_internal_redirect(ngx_http_request_t *r,
2553.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2551:1: Parameter `r->uri_changes`
          2549. 
          2550. 
          2551. ngx_int_t
                ^
          2552. ngx_http_internal_redirect(ngx_http_request_t *r,
          2553.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2557:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_process_body_in_memory` 
          2555.     ngx_http_core_srv_conf_t  *cscf;
          2556. 
          2557.     r->uri_changes--;
                    ^
          2558. 
          2559.     if (r->uri_changes == 0) {
