[Xen-changelog] [xen-unstable] Extra check in grant table code for mapping of shared frame

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
# Date 1347900717 -3600
# Node ID 5ba70e030b47b37c638054d4f22889f9a6c39b8e
# Parent  3bf63fcfacd1945381d34911d10b298e0df3883e
Extra check in grant table code for mapping of shared frame

Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
---


diff -r 3bf63fcfacd1 -r 5ba70e030b47 xen/common/grant_table.c
--- a/xen/common/grant_table.c  Mon Sep 17 11:17:05 2012 +0100
+++ b/xen/common/grant_table.c  Mon Sep 17 17:51:57 2012 +0100
@@ -708,9 +708,12 @@ __gnttab_map_grant_ref(
     }
     else if ( owner == rd || owner == dom_cow )
     {
-        if ( gnttab_host_mapping_get_page_type(op, ld, rd) &&
-             !get_page_type(pg, PGT_writable_page) )
-            goto could_not_pin;
+        if ( gnttab_host_mapping_get_page_type(op, ld, rd) )
+        {
+            if ( (owner == dom_cow) ||
+                 !get_page_type(pg, PGT_writable_page) )
+                goto could_not_pin;
+        }
 
         nr_gets++;
         if ( op->flags & GNTMAP_host_map )

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