From cdaea4db269646e25b97e8139a37849303c56e92 Mon Sep 17 00:00:00 2001
From: Greg Fitzgerald <garious@gmail.com>
Date: Thu, 19 Feb 2015 20:42:23 +0000
Subject: Fix heap-buffer-overflow bugs identified by the Address Sanitizer

Differential Revision: http://reviews.llvm.org/D7733

llvm-svn: 229912
---
 lld/lib/ReaderWriter/MachO/CompactUnwindPass.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lld/lib/ReaderWriter/MachO/CompactUnwindPass.cpp')

diff --git a/lld/lib/ReaderWriter/MachO/CompactUnwindPass.cpp b/lld/lib/ReaderWriter/MachO/CompactUnwindPass.cpp
index 40b257cd7a4..74b013f1d50 100644
--- a/lld/lib/ReaderWriter/MachO/CompactUnwindPass.cpp
+++ b/lld/lib/ReaderWriter/MachO/CompactUnwindPass.cpp
@@ -411,6 +411,9 @@ private:
       }
     }
 
+    if (atom->rawContent().size() < 4 * sizeof(uint32_t))
+      return entry;
+
     using normalized::read32;
     entry.rangeLength =
         read32(atom->rawContent().data() + 2 * sizeof(uint32_t), _isBig);
-- 
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