msi: Avoid an out of bounds access in msi_build_directory_name.

b7cefc99 · Hans Leidekker · Alexandre Julliard · 9177c088 · b7cefc99
Commit b7cefc99 authored Aug 01, 2012 by Hans Leidekker Committed by Alexandre Julliard Aug 13, 2012
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action.c dlls/msi/action.c +1 -1

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--- a/dlls/msi/action.c
+++ b/dlls/msi/action.c
@@ -2154,7 +2154,7 @@ WCHAR *msi_build_directory_name( DWORD count, ... )
        const WCHAR *str = va_arg( va, const WCHAR * );
        if (!str) continue;
        strcatW( dir, str );
-        if ( i + 1 != count && dir[strlenW( dir ) - 1] != '\\') strcatW( dir, szBackSlash );
+        if ( i + 1 != count && dir[0] && dir[strlenW( dir ) - 1] != '\\') strcatW( dir, szBackSlash );
    }
    va_end( va );
    return dir;