src/http/ngx_http_upstream.c:2190: error: Integer Overflow L2
  ([0, `r->uri_changes`] - 1):unsigned32 by call to `ngx_http_upstream_send_response`.

src/http/ngx_http_upstream.c:2047:1: Parameter `r->uri_changes`
2045. 
2046. 
2047. static void
      ^
2048. ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
2049. {

src/http/ngx_http_upstream.c:2185:9: Call
2183.     }
2184. 
2185.     if (ngx_http_upstream_process_headers(r, u) != NGX_OK) {
              ^
2186.         return;
2187.     }

src/http/ngx_http_upstream.c:2449:1: Parameter `r->uri_changes`
  2447. 
  2448. 
  2449. static ngx_int_t
        ^
  2450. ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2451. {

src/http/ngx_http_upstream.c:2190:9: Call
2188. 
2189.     if (!r->subrequest_in_memory) {
2190.         ngx_http_upstream_send_response(r, u);
              ^
2191.         return;
2192.     }

src/http/ngx_http_upstream.c:2669:1: Parameter `r->uri_changes`
  2667. 
  2668. 
  2669. static void
        ^
  2670. ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u)
  2671. {

src/http/ngx_http_upstream.c:2732:13: Call
  2730. 
  2731.         if (u->input_filter_init(u->input_filter_ctx) == NGX_ERROR) {
  2732.             ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
                    ^
  2733.             return;
  2734.         }

src/http/ngx_http_upstream.c:4065:1: Parameter `r->uri_changes`
    4063. 
    4064. 
    4065. static void
          ^
    4066. ngx_http_upstream_finalize_request(ngx_http_request_t *r,
    4067.     ngx_http_upstream_t *u, ngx_int_t rc)

src/http/ngx_http_upstream.c:4206:9: Call
    4204. 
    4205.     if (r->header_only) {
    4206.         ngx_http_finalize_request(r, rc);
                  ^
    4207.         return;
    4208.     }

src/http/ngx_http_request.c:2257:1: Parameter `r->uri_changes`
      2255. 
      2256. 
      2257. void
            ^
      2258. ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
      2259. {

src/http/ngx_http_request.c:2423:9: Call
      2421.     }
      2422. 
      2423.     if (ngx_http_post_action(r) == NGX_OK) {
                    ^
      2424.         return;
      2425.     }

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:2561:1: <LHS trace>
2559. 
2560. 
2561. ngx_int_t
      ^
2562. ngx_http_internal_redirect(ngx_http_request_t *r,
2563.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2561:1: Parameter `r->uri_changes`
          2559. 
          2560. 
          2561. ngx_int_t
                ^
          2562. ngx_http_internal_redirect(ngx_http_request_t *r,
          2563.     ngx_str_t *uri, ngx_str_t *args)

src/http/ngx_http_core_module.c:2567:5: Binary operation: ([0, r->uri_changes] - 1):unsigned32 by call to `ngx_http_upstream_send_response` 
          2565.     ngx_http_core_srv_conf_t  *cscf;
          2566. 
          2567.     r->uri_changes--;
                    ^
          2568. 
          2569.     if (r->uri_changes == 0) {
