From a92ad03946d296510c8c2ac18278608e8032b3f3 Mon Sep 17 00:00:00 2001
From: Jaroslav Bachorik <jbachorik@openjdk.org>
Date: Tue, 23 Apr 2024 12:14:57 +0000
Subject: [PATCH] 8329995: Restricted access to `/proc` can cause JFR
 initialization to crash

Reviewed-by: dholmes, egahlin
---
 src/hotspot/os/linux/os_perf_linux.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hotspot/os/linux/os_perf_linux.cpp b/src/hotspot/os/linux/os_perf_linux.cpp
index cca41a12ee1..87abbebe25f 100644
--- a/src/hotspot/os/linux/os_perf_linux.cpp
+++ b/src/hotspot/os/linux/os_perf_linux.cpp
@@ -847,7 +847,7 @@ SystemProcessInterface::SystemProcesses::ProcessIterator::ProcessIterator() {
 bool SystemProcessInterface::SystemProcesses::ProcessIterator::initialize() {
   _dir = os::opendir("/proc");
   _entry = nullptr;
-  _valid = true;
+  _valid = _dir != nullptr; // May be null if /proc is not accessible.
   next_process();
 
   return true;