[Xen-changelog] [xen-4.0-testing] xsm: Avoid null dereference in flask get_page_sid

["Xen patchbot-4.0-testing" <patchbot-4.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1284396614 -3600
# Node ID 208129cefcb30ae476af9a934008addf04e77cdc
# Parent  99b5871889e38c1b6a252e76dddd999b99ae5d7f
xsm: Avoid null dereference in flask get_page_sid

From: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
xen-unstable changeset:   22144:ec31bb01c424
xen-unstable date:        Mon Sep 13 17:27:22 2010 +0100
---
 xen/xsm/flask/hooks.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletion(-)

diff -r 99b5871889e3 -r 208129cefcb3 xen/xsm/flask/hooks.c
--- a/xen/xsm/flask/hooks.c     Mon Sep 13 17:21:06 2010 +0100
+++ b/xen/xsm/flask/hooks.c     Mon Sep 13 17:50:14 2010 +0100
@@ -340,7 +340,10 @@ static int get_page_sid(struct page_info
         default:
             /*Pages are implicitly labeled by domain ownership!*/
             dsec = d->ssid;
-            *sid = dsec->sid;
+            if (dsec)
+                *sid = dsec->sid;
+            else
+                rc = -ENOENT;
         break;
     }
 

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