src/http/ngx_http_upstream.c:1662: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_intercept_errors`.

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:1658:13: Call
1656.         }
1657. 
1658.         if (ngx_http_upstream_test_next(r, u) == NGX_OK) {
                  ^
1659.             return;
1660.         }

src/http/ngx_http_upstream.c:1713:1: Parameter `r->uri_changes`
  1711. 
  1712. 
  1713. static ngx_int_t
        ^
  1714. ngx_http_upstream_test_next(ngx_http_request_t *r, ngx_http_upstream_t *u)
  1715. {

src/http/ngx_http_upstream.c:1662:13: Call
1660.         }
1661. 
1662.         if (ngx_http_upstream_intercept_errors(r, u) == NGX_OK) {
                  ^
1663.             return;
1664.         }

src/http/ngx_http_upstream.c:1757:1: Parameter `r->uri_changes`
  1755. 
  1756. 
  1757. static ngx_int_t
        ^
  1758. ngx_http_upstream_intercept_errors(ngx_http_request_t *r,
  1759.     ngx_http_upstream_t *u)

src/http/ngx_http_upstream.c:1795:21: Call
  1793. 
  1794.                 if (h == NULL) {
  1795.                     ngx_http_upstream_finalize_request(r, u,
                            ^
  1796.                                                NGX_HTTP_INTERNAL_SERVER_ERROR);
  1797.                     return NGX_OK;

src/http/ngx_http_upstream.c:3296:1: Parameter `r->uri_changes`
    3294. 
    3295. 
    3296. static void
          ^
    3297. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
    3298.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:3425:9: Call
    3423. 
    3424.     if (r->header_only) {
    3425.         ngx_http_finalize_request(r, rc);
                  ^
    3426.         return;
    3427.     }

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_intercept_errors` 
          2555.     ngx_http_core_srv_conf_t  *cscf;
          2556. 
          2557.     r->uri_changes--;
                    ^
          2558. 
          2559.     if (r->uri_changes == 0) {
