[Xen-devel] [PATCH 8 of 9] x86/mm: Fix checks during foreign mapping of paged pages

[Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>]

 xen/arch/x86/mm.c |  3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)


Check that the valid mfn is the one we are mapping, not the
mfn of the page table of the foreign domain.

Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>

diff -r 5286ed662c1e -r 3489152b3a56 xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -3572,7 +3572,8 @@ int do_mmu_update(
                         rc = -ENOENT;
                         break;
                     }
-                    else if ( p2m_ram_paging_in_start == l1e_p2mt && 
!mfn_valid(mfn) )
+                    else if ( p2m_ram_paging_in_start == l1e_p2mt && 
+                                !mfn_valid(l1emfn) )
                     {
                         put_gfn(pg_owner, l1egfn);
                         rc = -ENOENT;

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