[Xen-changelog] [xen-unstable] python/xc: do not crash xend if /proc/xen/privcmd cannot be opened

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
# Date 1277218808 -3600
# Node ID 2ad890d46cb8a11fc6ea329126d398021307e627
# Parent  fa809ed6f534101158645c3f99be37a121eedb02
python/xc: do not crash xend if /proc/xen/privcmd cannot be opened

If /proc/xen/privcmd cannot be opened,
start xend occurs Segmentation fault.
Add check to fix it.

Signed-off-by: Yu Zhiguo <yuzg@xxxxxxxxxxxxxx>
---
 tools/python/xen/lowlevel/xc/xc.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r fa809ed6f534 -r 2ad890d46cb8 tools/python/xen/lowlevel/xc/xc.c
--- a/tools/python/xen/lowlevel/xc/xc.c Tue Jun 22 15:39:42 2010 +0100
+++ b/tools/python/xen/lowlevel/xc/xc.c Tue Jun 22 16:00:08 2010 +0100
@@ -72,7 +72,8 @@ static PyObject *pyxc_error_to_exception
     else
         pyerr = Py_BuildValue("(is)", err->code, desc);
 
-    xc_clear_last_error(xch);
+    if (xch)
+        xc_clear_last_error(xch);
 
     if ( pyerr != NULL )
     {

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