commit 7beb7e0f65c6f66daebd307c492381249ddd41be
Author: Vincent Untz <vuntz@gnome.org>
Date:   Wed Jan 5 10:32:44 2011 +0100

    gnome-shell.in: Really never add empty elements to LD_LIBRARY_PATH
    
    This complements the fix from c6eb2761, to make sure that we don't use
    the pre-existing $LD_LIBRARY_PATH if it's set but empty.
    
    Both commits fix CVE-2010-4000.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=638728

diff --git a/src/gnome-shell.in b/src/gnome-shell.in
index 2abd7d5..e422adb 100755
--- a/src/gnome-shell.in
+++ b/src/gnome-shell.in
@@ -152,7 +152,7 @@ def start_dconf_await_service():
     # dconf is linked without libtool, so unlike other GNOME modules,
     # won't have an embedded rpath for its library directory.
     env = dict(os.environ)
-    if 'LD_LIBRARY_PATH' in env:
+    if 'LD_LIBRARY_PATH' in env and env['LD_LIBRARY_PATH']:
         ld_library_path = '@libdir@:' + env['LD_LIBRARY_PATH']
     else:
         ld_library_path = '@libdir@'
@@ -246,7 +246,7 @@ def start_shell(perf_output=None):
     if pkgconfig.returncode == 0:
         mozjs_libdir = re.sub('-(sdk|devel)', '', mozjs_sdkdir)
         if os.path.exists(mozjs_libdir + '/libmozjs.so'):
-            if 'LD_LIBRARY_PATH' in env:
+            if 'LD_LIBRARY_PATH' in env and env['LD_LIBRARY_PATH']:
                 ld_library_path = env['LD_LIBRARY_PATH'] + ':' + mozjs_libdir
             else:
                 ld_library_path = mozjs_libdir