From 87c03cb0296811f27a6e35dc298a8dd5a0544317 Mon Sep 17 00:00:00 2001
From: Andrei Pangin <noreply@pangin.pro>
Date: Tue, 16 Jul 2024 21:59:18 +0100
Subject: [PATCH] Fix unsafe access to CodeCache

---
 ddprof-lib/src/main/cpp/stackWalker.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ddprof-lib/src/main/cpp/stackWalker.cpp b/ddprof-lib/src/main/cpp/stackWalker.cpp
index 24b56f79d..7e19ed693 100644
--- a/ddprof-lib/src/main/cpp/stackWalker.cpp
+++ b/ddprof-lib/src/main/cpp/stackWalker.cpp
@@ -158,7 +158,8 @@ int StackWalker::walkDwarf(void *ucontext, const void **callchain,
     }
     if (CodeHeap::contains(pc) && !(depth == 0 && frame.unwindAtomicStub(pc))) {
       const void* page_start = (const void*)((uintptr_t)pc & ~0xfffUL);
-      frame.adjustSP(page_start, pc, sp);
+      // Don't dereference pc as it may point to unreadable memory
+      // frame.adjustSP(page_start, pc, sp);
       java_ctx->set(pc, sp, fp);
       break;
     }