msi 1: Fix a heap corruption bug by resizing the src string before adding to it

[James Hawkins]

Hi,

This fixes bug 6598.  http://bugs.winehq.org/show_bug.cgi?id=6598

Changelog:
* Fix a heap corruption bug by resizing the src string before adding to it.

 dlls/msi/files.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

-- 
James Hawkins
-------------- next part --------------
diff --git a/dlls/msi/files.c b/dlls/msi/files.c
index 38b1f8f..dc81e6a 100644
--- a/dlls/msi/files.c
+++ b/dlls/msi/files.c
@@ -469,8 +469,13 @@ static UINT download_remote_cabinet(MSIP
 
     *(ptr + 1) = '\0';
     ptr = strrchrW(mi->source, '\\');
+    src = msi_realloc(src, (lstrlenW(src) + lstrlenW(ptr)) * sizeof(WCHAR));
+    if (!src)
+        return ERROR_OUTOFMEMORY;
+
     lstrcatW(src, ptr + 1);
 
+    temppath[0] = '\0';
     cab = msi_download_file(src, temppath);
     lstrcpyW(mi->source, cab);
 
-- 
1.4.3