From e4ac19a87a5ca4fbdcc51780ca4b8866c1690baa Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Wed, 2 Sep 2009 09:58:50 +0200
Subject: [PATCH] lxc: avoid NULL dereference upon getmntent failure

* src/lxc_container.c (lxcContainerUnmountOldFS): Don't pass
a NULL pointer to qsort.
---
 src/lxc_container.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/lxc_container.c b/src/lxc_container.c
index 950dd50215..20738648a5 100644
--- a/src/lxc_container.c
+++ b/src/lxc_container.c
@@ -546,8 +546,9 @@ static int lxcContainerUnmountOldFS(void)
     }
     endmntent(procmnt);
 
-    qsort(mounts, nmounts, sizeof(mounts[0]),
-          lxcContainerChildMountSort);
+    if (mounts)
+        qsort(mounts, nmounts, sizeof(mounts[0]),
+              lxcContainerChildMountSort);
 
     for (i = 0 ; i < nmounts ; i++) {
         VIR_DEBUG("Umount %s", mounts[i]);