net: make writeAfterFIN() return false

If `false` is not returned a readable stream piped into the socket
might continue reading indefinitely until the process goes out of
memory.

PR-URL: https://github.com/nodejs/node/pull/27996
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/net.js b/lib/net.js
index 54ddaa3b40..6c2bf56875 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -410,6 +410,8 @@ function writeAfterFIN(chunk, encoding, cb) {
   if (typeof cb === 'function') {
     defaultTriggerAsyncIdScope(this[async_id_symbol], process.nextTick, cb, er);
   }
+
+  return false;
 }
 
 Socket.prototype.setTimeout = setStreamTimeout;