From: Yu Zhiguo <yuzg@cn.fujitsu.com>
Subject: [PATCH] libxc: Fix Segmentation fault of xend
Date: Sat, 19 Jun 2010 14:23:01 +0800
Message-ID: <4C1C6245.9050402@cn.fujitsu.com>
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If /proc/xen/privcmd cannot be opened,
start xend occurs Segmentation fault.
Add check to fix it.

Signed-off-by: Yu Zhiguo <yuzg@cn.fujitsu.com>

diff -r b9c541d9c138 -r 659e4b69d26b tools/libxc/xc_private.c
--- a/tools/libxc/xc_private.c	Tue Jun 15 13:27:14 2010 +0100
+++ b/tools/libxc/xc_private.c	Sat Jun 19 22:24:09 2010 +0800
@@ -82,8 +82,10 @@
 
 void xc_clear_last_error(xc_interface *xch)
 {
-    xch->last_error.code = XC_ERROR_NONE;
-    xch->last_error.message[0] = '\0';
+    if (xch) {
+        xch->last_error.code = XC_ERROR_NONE;
+        xch->last_error.message[0] = '\0';
+    }
 }
 
 const char *xc_error_code_to_desc(int code)