src/http/modules/ngx_http_geo_module.c:242: error: Buffer Overrun L3
  Offset: [-2, +oo] Size: [0, +oo] by call to `ngx_http_add_variable`.

src/http/modules/ngx_http_geo_module.c:224:5: Assignment
222. 
223.     name = value[1];
224.     name.len--;
         ^
225.     name.data++;
226. 

src/http/modules/ngx_http_geo_module.c:242:11: Call
240.     }
241. 
242.     var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGEABLE);
               ^
243.     if (var == NULL) {
244.         return NGX_CONF_ERROR;

src/http/ngx_http_variables.c:257:1: Parameter `name->len`
  255. 
  256. 
  257. ngx_http_variable_t *
       ^
  258. ngx_http_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
  259. {

src/http/ngx_http_variables.c:292:5: Assignment
  290.     }
  291. 
  292.     v->name.len = name->len;
           ^
  293.     v->name.data = ngx_pnalloc(cf->pool, name->len);
  294.     if (v->name.data == NULL) {

src/http/ngx_http_variables.c:306:10: Call
  304.     v->index = 0;
  305. 
  306.     rc = ngx_hash_add_key(cmcf->variables_keys, &v->name, v, 0);
                ^
  307. 
  308.     if (rc == NGX_ERROR) {

src/core/ngx_hash.c:713:1: <Offset trace>
711. 
712. 
713. ngx_int_t
     ^
714. ngx_hash_add_key(ngx_hash_keys_arrays_t *ha, ngx_str_t *key, void *value,
715.     ngx_uint_t flags)

src/core/ngx_hash.c:713:1: Parameter `key->len`
    711. 
    712. 
    713. ngx_int_t
         ^
    714. ngx_hash_add_key(ngx_hash_keys_arrays_t *ha, ngx_str_t *key, void *value,
    715.     ngx_uint_t flags)

src/core/ngx_hash.c:713:1: <Length trace>
711. 
712. 
713. ngx_int_t
     ^
714. ngx_hash_add_key(ngx_hash_keys_arrays_t *ha, ngx_str_t *key, void *value,
715.     ngx_uint_t flags)

src/core/ngx_hash.c:713:1: Parameter `*key->data`
    711. 
    712. 
    713. ngx_int_t
         ^
    714. ngx_hash_add_key(ngx_hash_keys_arrays_t *ha, ngx_str_t *key, void *value,
    715.     ngx_uint_t flags)

src/core/ngx_hash.c:760:17: Array access: Offset: [-2, +oo] Size: [0, +oo] by call to `ngx_http_add_variable` 
    758.             }
    759. 
    760.             if (key->data[i - 2] == '.' && key->data[i - 1] == '*') {
                         ^
    761.                 skip = 0;
    762.                 last -= 2;
