src/http/modules/ngx_http_userid_filter_module.c:573: error: Buffer Overrun L3
  Offset: [-2, +oo] Size: [0, +oo] by call to `ngx_http_add_variable`.

src/http/modules/ngx_http_userid_filter_module.c:573:11: Call
571.     ngx_http_variable_t  *var;
572. 
573.     var = ngx_http_add_variable(cf, &ngx_http_userid_got, 0);
               ^
574.     if (var == NULL) {
575.         return NGX_ERROR;

src/http/ngx_http_variables.c:267:1: Parameter `name->len`
  265. 
  266. 
  267. ngx_http_variable_t *
       ^
  268. ngx_http_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
  269. {

src/http/ngx_http_variables.c:302:5: Assignment
  300.     }
  301. 
  302.     v->name.len = name->len;
           ^
  303.     v->name.data = ngx_pnalloc(cf->pool, name->len);
  304.     if (v->name.data == NULL) {

src/http/ngx_http_variables.c:316:10: Call
  314.     v->index = 0;
  315. 
  316.     rc = ngx_hash_add_key(cmcf->variables_keys, &v->name, v, 0);
                ^
  317. 
  318.     if (rc == NGX_ERROR) {

src/core/ngx_hash.c:705:1: <Offset trace>
703. 
704. 
705. ngx_int_t
     ^
706. ngx_hash_add_key(ngx_hash_keys_arrays_t *ha, ngx_str_t *key, void *value,
707.     ngx_uint_t flags)

src/core/ngx_hash.c:705:1: Parameter `key->len`
    703. 
    704. 
    705. ngx_int_t
         ^
    706. ngx_hash_add_key(ngx_hash_keys_arrays_t *ha, ngx_str_t *key, void *value,
    707.     ngx_uint_t flags)

src/core/ngx_hash.c:705:1: <Length trace>
703. 
704. 
705. ngx_int_t
     ^
706. ngx_hash_add_key(ngx_hash_keys_arrays_t *ha, ngx_str_t *key, void *value,
707.     ngx_uint_t flags)

src/core/ngx_hash.c:705:1: Parameter `*key->data`
    703. 
    704. 
    705. ngx_int_t
         ^
    706. ngx_hash_add_key(ngx_hash_keys_arrays_t *ha, ngx_str_t *key, void *value,
    707.     ngx_uint_t flags)

src/core/ngx_hash.c:752:17: Array access: Offset: [-2, +oo] Size: [0, +oo] by call to `ngx_http_add_variable` 
    750.             }
    751. 
    752.             if (key->data[i - 2] == '.' && key->data[i - 1] == '*') {
                         ^
    753.                 skip = 0;
    754.                 last -= 2;
