commit c484d8904285652246c3af212a4211b9a8955149

Author: Thomas Stuefe <stuefe@openjdk.org>

Date:   Tue Mar 16 05:49:01 2021 +0000

    8263557: Possible NULL dereference in Arena::destruct_contents()

    Reviewed-by: kbarrett, coleenp

diff --git src/hotspot/share/memory/arena.cpp src/hotspot/share/memory/arena.cpp

index 8388f68c359..16059bed9be 100644

--- src/hotspot/share/memory/arena.cpp

+++ src/hotspot/share/memory/arena.cpp

@@ -310,7 +310,9 @@ void Arena::destruct_contents() {

   // reset size before chop to avoid a rare racing condition

   // that can have total arena memory exceed total chunk memory

   set_size_in_bytes(0);

-  _first->chop();

+  if (_first != NULL) {

+    _first->chop();

+  }

   reset();

 }