[Xen-devel] [PATCH] x86/emulate: Check current->arch.vm_event in hvmemul_virtual_to_linear()

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

Theoretically it is possible for mem_access_emulate_each_rep to be
true even when current->arch.vm_event == NULL, so add an extra
check to hvmemul_virtual_to_linear().

Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/emulate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index f5ab5bc..91413d2 100644
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -514,7 +514,7 @@ static int hvmemul_virtual_to_linear(
      * vm_event being triggered for repeated writes to a whole page.
      */
     if ( unlikely(current->domain->arch.mem_access_emulate_each_rep) &&
-         current->arch.vm_event->emulate_flags != 0 )
+         current->arch.vm_event && current->arch.vm_event->emulate_flags != 0 )
        max_reps = 1;
 
     /*
-- 
1.9.1


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