src/http/ngx_http_file_cache.c:1336: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned64 by call to `ngx_http_file_cache_exists`.

src/http/ngx_http_file_cache.c:1336:9: Call
1334.     ngx_memcpy(c->key, c->main, NGX_HTTP_CACHE_KEY_LEN);
1335. 
1336.     if (ngx_http_file_cache_exists(cache, c) == NGX_ERROR) {
              ^
1337.         return NGX_ERROR;
1338.     }

src/http/ngx_http_file_cache.c:814:1: Parameter `cache->sh->count`
  812. 
  813. 
  814. static ngx_int_t
       ^
  815. ngx_http_file_cache_exists(ngx_http_file_cache_t *cache, ngx_http_cache_t *c)
  816. {

src/http/ngx_http_file_cache.c:871:16: Call
  869.         ngx_shmtx_unlock(&cache->shpool->mutex);
  870. 
  871.         (void) ngx_http_file_cache_forced_expire(cache);
                      ^
  872. 
  873.         ngx_shmtx_lock(&cache->shpool->mutex);

src/http/ngx_http_file_cache.c:1691:1: Parameter `cache->sh->count`
    1689. 
    1690. 
    1691. static time_t
          ^
    1692. ngx_http_file_cache_forced_expire(ngx_http_file_cache_t *cache)
    1693. {

src/http/ngx_http_file_cache.c:1732:13: Call
    1730. 
    1731.         if (fcn->count == 0) {
    1732.             ngx_http_file_cache_delete(cache, q, name);
                      ^
    1733.             wait = 0;
    1734. 

src/http/ngx_http_file_cache.c:1848:1: <LHS trace>
1846. 
1847. 
1848. static void
      ^
1849. ngx_http_file_cache_delete(ngx_http_file_cache_t *cache, ngx_queue_t *q,
1850.     u_char *name)

src/http/ngx_http_file_cache.c:1848:1: Parameter `cache->sh->count`
      1846. 
      1847. 
      1848. static void
            ^
      1849. ngx_http_file_cache_delete(ngx_http_file_cache_t *cache, ngx_queue_t *q,
      1850.     u_char *name)

src/http/ngx_http_file_cache.c:1894:9: Binary operation: ([0, +oo] - 1):unsigned64 by call to `ngx_http_file_cache_exists` 
      1892.         ngx_rbtree_delete(&cache->sh->rbtree, &fcn->node);
      1893.         ngx_slab_free_locked(cache->shpool, fcn);
      1894.         cache->sh->count--;
                    ^
      1895.     }
      1896. }
