async_hooks: check for empty contexts before removing

This way we don't end up attempting to SetPromiseHooks on contexts that
have already been collected.

Fixes: https://github.com/nodejs/node/issues/39019

PR-URL: https://github.com/nodejs/node/pull/39095
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Andrey Pechkurov <apechkurov@gmail.com>
Reviewed-By: Danielle Adams <adamzdanielle@gmail.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/src/env-inl.h b/src/env-inl.h
index 6fb8f137c3..b3b1ea9082 100644
--- a/src/env-inl.h
+++ b/src/env-inl.h
@@ -104,6 +104,11 @@ inline void AsyncHooks::SetJSPromiseHooks(v8::Local<v8::Function> init,
   js_promise_hooks_[2].Reset(env()->isolate(), after);
   js_promise_hooks_[3].Reset(env()->isolate(), resolve);
   for (auto it = contexts_.begin(); it != contexts_.end(); it++) {
+    if (it->IsEmpty()) {
+      it = contexts_.erase(it);
+      it--;
+      continue;
+    }
     PersistentToLocal::Weak(env()->isolate(), *it)
         ->SetPromiseHooks(init, before, after, resolve);
   }
@@ -256,8 +261,13 @@ inline void AsyncHooks::RemoveContext(v8::Local<v8::Context> ctx) {
   v8::Isolate* isolate = env()->isolate();
   v8::HandleScope handle_scope(isolate);
   for (auto it = contexts_.begin(); it != contexts_.end(); it++) {
+    if (it->IsEmpty()) {
+      it = contexts_.erase(it);
+      it--;
+      continue;
+    }
     v8::Local<v8::Context> saved_context =
-      PersistentToLocal::Weak(env()->isolate(), *it);
+      PersistentToLocal::Weak(isolate, *it);
     if (saved_context == ctx) {
       it->Reset();
       contexts_.erase(it);