From: Keir Fraser <keir.fraser@citrix.com>
Date: Mon, 13 Sep 2010 16:27:22 +0000 (+0100)
Subject: xsm: Avoid null dereference in flask get_page_sid
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~11498
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:/%22bookmarks://%22Dat/%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22Dat?a=commitdiff_plain;h=bdc9bc5f487857f69d84e334a1bbd491c9d9b527;p=xen.git

xsm: Avoid null dereference in flask get_page_sid

From: Daniel De Graaf <dgdegra@tycho.nsa.gov>
---

diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index b2bf4023f1..c58f8d71b6 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -340,7 +340,10 @@ static int get_page_sid(struct page_info *page, u32 *sid)
         default:
             /*Pages are implicitly labeled by domain ownership!*/
             dsec = d->ssid;
-            *sid = dsec->sid;
+            if (dsec)
+                *sid = dsec->sid;
+            else
+                rc = -ENOENT;
         break;
     }