From 2b5963f8e2959e8c4a6735cb70e1489503539ac1 Mon Sep 17 00:00:00 2001
From: James Hawkins <truiken@gmail.com>
Date: Fri, 28 Apr 2006 20:16:41 -0500
Subject: [PATCH] ole32: StorageImpl_GetROBigBlock can return NULL so check for
 NULL before doing a memcpy.

---
 dlls/ole32/storage32.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dlls/ole32/storage32.c b/dlls/ole32/storage32.c
index 5e6696c4e2..a3f21d5411 100644
--- a/dlls/ole32/storage32.c
+++ b/dlls/ole32/storage32.c
@@ -4493,6 +4493,8 @@ BOOL BlockChainStream_ReadAt(BlockChainStream* This,
      */
     bigBlockBuffer =
       StorageImpl_GetROBigBlock(This->parentStorage, blockIndex);
+    if (!bigBlockBuffer)
+        return FALSE;
 
     memcpy(bufferWalker, bigBlockBuffer + offsetInBlock, bytesToReadInBuffer);