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-rw-r--r--system/xen/xsa/xsa232.patch23
1 files changed, 23 insertions, 0 deletions
diff --git a/system/xen/xsa/xsa232.patch b/system/xen/xsa/xsa232.patch
new file mode 100644
index 0000000000..9e5f35c7d6
--- /dev/null
+++ b/system/xen/xsa/xsa232.patch
@@ -0,0 +1,23 @@
+From: Andrew Cooper <andrew.cooper3@citrix.com>
+Subject: grant_table: fix GNTTABOP_cache_flush handling
+
+Don't fall over a NULL grant_table pointer when the owner of the domain
+is a system domain (DOMID_{XEN,IO} etc).
+
+This is XSA-232.
+
+Reported-by: Matthew Daley <mattd@bugfuzz.com>
+Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+--- a/xen/common/grant_table.c
++++ b/xen/common/grant_table.c
+@@ -3053,7 +3053,7 @@ static int cache_flush(gnttab_cache_flus
+
+ page = mfn_to_page(mfn);
+ owner = page_get_owner_and_reference(page);
+- if ( !owner )
++ if ( !owner || !owner->grant_table )
+ {
+ rcu_unlock_domain(d);
+ return -EPERM;