From 66747710a49ea6a78aee94d3a3ec6a24b7cc36e5 Mon Sep 17 00:00:00 2001
From: Dean Long <dlong@openjdk.org>
Date: Fri, 23 May 2025 19:29:09 +0000
Subject: [PATCH] 8357468: [asan] heap buffer overflow reported in
 PcDesc::pc_offset() pcDesc.hpp:57

Reviewed-by: kvn, thartmann
---
 src/hotspot/share/code/nmethod.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/hotspot/share/code/nmethod.cpp b/src/hotspot/share/code/nmethod.cpp
index ed6167dac22..83afc02cdfc 100644
--- a/src/hotspot/share/code/nmethod.cpp
+++ b/src/hotspot/share/code/nmethod.cpp
@@ -393,7 +393,9 @@ static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
   if (!approximate) {
     return pc->pc_offset() == pc_offset;
   } else {
-    return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
+    // Do not look before the sentinel
+    assert(pc_offset > PcDesc::lower_offset_limit, "illegal pc_offset");
+    return pc_offset <= pc->pc_offset() && (pc-1)->pc_offset() < pc_offset;
   }
 }