From 7e3335542c7f4e37dba8db3cefd59dde1e1b10ca Mon Sep 17 00:00:00 2001
From: joerg <joerg@NetBSD.org>
Date: Sat, 3 May 2014 23:19:56 +0000
Subject: [PATCH] Missing register validation check.

---
 sys/lib/libunwind/DwarfParser.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/lib/libunwind/DwarfParser.hpp b/sys/lib/libunwind/DwarfParser.hpp
index 509f6d57f158..6e8ef2cab4c7 100644
--- a/sys/lib/libunwind/DwarfParser.hpp
+++ b/sys/lib/libunwind/DwarfParser.hpp
@@ -461,6 +461,8 @@ CFI_Parser<A, R>::parseInstructions(A &addressSpace, pint_t instructions,
       reg = R::dwarf2regno(addressSpace.getULEB128(p, instructionsEnd));
       offset =
           addressSpace.getULEB128(p, instructionsEnd) * cieInfo.dataAlignFactor;
+      if (reg > kMaxRegisterNumber)
+        return false;
       results->savedRegisters[reg].location = kRegisterOffsetFromCFA;
       results->savedRegisters[reg].value = offset;
       break;