From 8542b93426e4fa82abd3d8b0d51722e6f7cff869 Mon Sep 17 00:00:00 2001
From: morris <unknown>
Date: Sat, 16 Mar 2013 07:41:09 -0700
Subject: [PATCH] 8010144: [parfait] Null pointer deference in
 hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp Summary: add null check to
 signal handler Reviewed-by: dcubed

---
 src/os_cpu/linux_x86/vm/os_linux_x86.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/os_cpu/linux_x86/vm/os_linux_x86.cpp b/src/os_cpu/linux_x86/vm/os_linux_x86.cpp
index 4c9d3dbed..5cdab45d4 100644
--- a/src/os_cpu/linux_x86/vm/os_linux_x86.cpp
+++ b/src/os_cpu/linux_x86/vm/os_linux_x86.cpp
@@ -340,7 +340,7 @@ JVM_handle_linux_signal(int sig,
         // here if the underlying file has been truncated.
         // Do not crash the VM in such a case.
         CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
-        nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
+        nmethod* nm = (cb != NULL && cb->is_nmethod()) ? (nmethod*)cb : NULL;
         if (nm != NULL && nm->has_unsafe_access()) {
           stub = StubRoutines::handler_for_unsafe_access();
         }
-- 
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