diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
index 8c37854..90b10a8 100644
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -245,6 +245,8 @@ ngx_http_v2_init(ngx_event_t *rev)
h2scf = ngx_http_get_module_srv_conf(hc->conf_ctx, ngx_http_v2_module);
+ h2c->priority_limit = h2scf->concurrent_streams;
+
h2c->pool = ngx_create_pool(h2scf->pool_size, h2c->connection->log);
if (h2c->pool == NULL) {
ngx_http_close_connection(c);
@@ -1763,6 +1765,13 @@ ngx_http_v2_state_priority(ngx_http_v2_connection_t *h2c, u_char *pos,
return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_SIZE_ERROR);
}
+ if (--h2c->priority_limit == 0) {
+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
+ "client sent too many PRIORITY frames");
+
+ return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_ENHANCE_YOUR_CALM);
+ }
+
if (end - pos < NGX_HTTP_V2_PRIORITY_SIZE) {
return ngx_http_v2_state_save(h2c, pos, end,
ngx_http_v2_state_priority);
@@ -2821,6 +2830,8 @@ ngx_http_v2_create_stream(ngx_http_v2_connection_t *h2c)
h2c->processing++;
+ h2c->priority_limit += h2scf->concurrent_streams;
+
return stream;
}
diff --git a/src/http/v2/ngx_http_v2.h b/src/http/v2/ngx_http_v2.h
index 112779e..8e56ee5 100644
--- a/src/http/v2/ngx_http_v2.h
+++ b/src/http/v2/ngx_http_v2.h
@@ -116,6 +116,7 @@ struct ngx_http_v2_connection_s {
ngx_uint_t processing;
ngx_uint_t frames;
+ ngx_uint_t priority_limit;
size_t send_window;
size_t recv_window;