From c840b5c6e8f0c4d5f3ea11d5a2e8b94cae5ada75 Mon Sep 17 00:00:00 2001
From: Ahmed Bougacha <ahmed.bougacha@gmail.com>
Date: Thu, 27 Apr 2017 02:09:44 +0000
Subject: [PATCH] [Support] Fix overflow in SLEB128 decoding.

decodeULEB128 was fixed in r216268, but decodeSLEB128 always had the
same issue, which is now exposed in r301369.

llvm-svn: 301510
---
 include/llvm/Support/LEB128.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/llvm/Support/LEB128.h b/include/llvm/Support/LEB128.h
index a2bcef81bee..29640db6921 100644
--- a/include/llvm/Support/LEB128.h
+++ b/include/llvm/Support/LEB128.h
@@ -160,7 +160,7 @@ inline int64_t decodeSLEB128(const uint8_t *p, unsigned *n = nullptr,
       return 0;
     }
     Byte = *p++;
-    Value |= ((Byte & 0x7f) << Shift);
+    Value |= (int64_t(Byte & 0x7f) << Shift);
     Shift += 7;
   } while (Byte >= 128);
   // Sign extend negative numbers.