src/http/ngx_http_upstream.c:2023: 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: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:2023:5: Call
2021.     u->read_event_handler = ngx_http_upstream_process_body_in_memory;
2022. 
2023.     ngx_http_upstream_process_body_in_memory(r, u);
          ^
2024. }
2025. 

src/http/ngx_http_upstream.c:2387:1: Parameter `r->uri_changes`
  2385. 
  2386. 
  2387. static void
        ^
  2388. ngx_http_upstream_process_body_in_memory(ngx_http_request_t *r,
  2389.     ngx_http_upstream_t *u)

src/http/ngx_http_upstream.c:2405:9: Call
  2403.     if (rev->timedout) {
  2404.         ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out");
  2405.         ngx_http_upstream_finalize_request(r, u, NGX_HTTP_GATEWAY_TIME_OUT);
                ^
  2406.         return;
  2407.     }

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:3887:9: Call
    3885. 
    3886.     if (r->header_only) {
    3887.         ngx_http_finalize_request(r, rc);
                  ^
    3888.         return;
    3889.     }

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_process_body_in_memory` 
          2585.     ngx_http_core_srv_conf_t  *cscf;
          2586. 
          2587.     r->uri_changes--;
                    ^
          2588. 
          2589.     if (r->uri_changes == 0) {
