src/http/ngx_http_upstream.c:1791: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_finalize_request`.

src/http/ngx_http_upstream.c:1754:1: Parameter `r->uri_changes`
1752. 
1753. 
1754. static ngx_int_t
      ^
1755. ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u)
1756. {

src/http/ngx_http_upstream.c:1769:9: Call
1767.         && !(u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_XA_REDIRECT))
1768.     {
1769.         ngx_http_upstream_finalize_request(r, u, NGX_DECLINED);
              ^
1770. 
1771.         part = &u->headers_in.headers.part;

src/http/ngx_http_upstream.c:2843:1: Parameter `r->uri_changes`
  2841. 
  2842. 
  2843. static void
        ^
  2844. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
  2845.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:1791:21: Call
1789.             if (hh && hh->redirect) {
1790.                 if (hh->copy_handler(r, &h[i], hh->conf) != NGX_OK) {
1791.                     ngx_http_finalize_request(r,
                          ^
1792.                                               NGX_HTTP_INTERNAL_SERVER_ERROR);
1793.                     return NGX_DONE;

src/http/ngx_http_request.c:1847:1: Parameter `r->uri_changes`
  1845. 
  1846. 
  1847. void
        ^
  1848. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
  1849. {

src/http/ngx_http_request.c:1886:13: Call
  1884.         || c->error)
  1885.     {
  1886.         if (ngx_http_post_action(r) == NGX_OK) {
                    ^
  1887.             return;
  1888.         }

src/http/ngx_http_request.c:2846:1: Parameter `r->uri_changes`
    2844. 
    2845. 
    2846. static ngx_int_t
          ^
    2847. ngx_http_post_action(ngx_http_request_t *r)
    2848. {

src/http/ngx_http_request.c:2869:9: Call
    2867. 
    2868.     if (clcf->post_action.data[0] == '/') {
    2869.         ngx_http_internal_redirect(r, &clcf->post_action, NULL);
                  ^
    2870. 
    2871.     } else {

src/http/ngx_http_core_module.c:2172:1: <LHS trace>
2170. 
2171. 
2172. ngx_int_t
      ^
2173. ngx_http_internal_redirect(ngx_http_request_t *r,
2174.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2172:1: Parameter `r->uri_changes`
      2170. 
      2171. 
      2172. ngx_int_t
            ^
      2173. ngx_http_internal_redirect(ngx_http_request_t *r,
      2174.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2178:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_finalize_request` 
      2176.     ngx_http_core_srv_conf_t  *cscf;
      2177. 
      2178.     r->uri_changes--;
                ^
      2179. 
      2180.     if (r->uri_changes == 0) {
