fix(ext/websocket): do not continue reading if socket rid closes (#21849)

Fixes https://github.com/denoland/deno/issues/21379

1 files changed, 12 insertions, 2 deletions

diff --git a/ext/websocket/01_websocket.js b/ext/websocket/01_websocket.js
index 15793a886..6c9bbc157 100644
--- a/ext/websocket/01_websocket.js
+++ b/ext/websocket/01_websocket.js
@@ -417,9 +417,14 @@ class WebSocket extends EventTarget {
       switch (kind) {
         case 0: {
           /* string */
+          const data = op_ws_get_buffer_as_string(rid);
+          if (data === undefined) {
+            break;
+          }
+
           this[_serverHandleIdleTimeout]();
           const event = new MessageEvent("message", {
-            data: op_ws_get_buffer_as_string(rid),
+            data,
             origin: this[_url],
           });
           setIsTrusted(event, true);
@@ -428,9 +433,14 @@ class WebSocket extends EventTarget {
         }
         case 1: {
           /* binary */
+          const d = op_ws_get_buffer(rid);
+          if (d == undefined) {
+            break;
+          }
+
           this[_serverHandleIdleTimeout]();
           // deno-lint-ignore prefer-primordials
-          const buffer = op_ws_get_buffer(rid).buffer;
+          const buffer = d.buffer;
           let data;
           if (this.binaryType === "blob") {
             data = new Blob([buffer]);