[PATCH v4 2/2] x86/hvm: Add check when register io handler

[<suravee.suthikulpanit@amd.com>]

From: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>

At the time of registering HVM I/O handler, the HVM domain might
not have been initialized, which means the hvm_domain.io_handler
would be NULL. In the hvm_next_io_handler(), this should be asserted.

Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 xen/arch/x86/hvm/intercept.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/arch/x86/hvm/intercept.c b/xen/arch/x86/hvm/intercept.c
index fc757d0..bf141c9 100644
--- a/xen/arch/x86/hvm/intercept.c
+++ b/xen/arch/x86/hvm/intercept.c
@@ -258,6 +258,8 @@ struct hvm_io_handler *hvm_next_io_handler(struct domain *d)
 {
     unsigned int i = d->arch.hvm_domain.io_handler_count++;
 
+    ASSERT(d->arch.hvm_domain.io_handler);
+
     if ( i == NR_IO_HANDLERS )
     {
         domain_crash(d);
-- 
1.9.1


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