http2: clear the session timeout before marking it destroyed

closeSession() set SESSION_FLAGS_DESTROYED and then called
session.setTimeout(0). setStreamTimeout() returns early when the session is
destroyed, so the idle timer stayed armed and retained the session until the
server timeout fired.

Clear the timeout and remove its listeners before setting the destroyed
flag.

Fixes: #66885
Signed-off-by: huang <13165998033@163.com>

Author: Huang-404-Q

lib/internal/http2/core.js

@@ -1303,13 +1303,16 @@ function closeSession(session, code, error) {
   debugSessionObj(session, 'start closing/destroying', error);
 
   const state = session[kState];
-  state.flags |= SESSION_FLAGS_DESTROYED;
-  state.destroyCode = code;
 
-  // Clear timeout and remove timeout listeners.
+  // Clear timeout and remove timeout listeners before marking the session
+  // destroyed: setTimeout() is a no-op once destroyed, so the idle timer
+  // would otherwise stay armed and retain the session.
   session.setTimeout(0);
   session.removeAllListeners('timeout');
 
+  state.flags |= SESSION_FLAGS_DESTROYED;
+  state.destroyCode = code;
+
   const socket = session[kSocket];
   const handle = session[kHandle];
 

test/parallel/test-http2-session-timeout-cleared-on-close.js

@@ -0,0 +1,32 @@
+'use strict';
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+const assert = require('assert');
+const http2 = require('http2');
+
+// A destroyed session must not keep its idle timer armed: setTimeout() is a
+// no-op once the session is marked destroyed, so closeSession() has to clear
+// the timer first.
+const server = http2.createServer();
+server.setTimeout(30_000, common.mustNotCall());
+
+server.on('session', common.mustCall((session) => {
+  session.on('close', common.mustCall(() => {
+    assert.strictEqual(session.timeout, 0);
+    server.close();
+  }));
+}));
+
+server.on('stream', common.mustCall((stream) => {
+  stream.respond({ ':status': 200 });
+  stream.end('ok');
+}));
+
+server.listen(0, common.mustCall(() => {
+  const client = http2.connect(`http://localhost:${server.address().port}`);
+  const req = client.request();
+  req.resume();
+  req.on('end', common.mustCall(() => client.close()));
+}));