[Xen-changelog] [xen-unstable] [IA64] Fix Xen crash when creating VTI domain

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User awilliam@xxxxxxxxxxxx
# Date 1169579222 25200
# Node ID 10dd3c907ca772a4a7134543427f8e847ab01d90
# Parent  b59b6173455d0034503bae93a5f98e887ba51873
[IA64] Fix Xen crash when creating VTI domain

Xend will do a hypercall to destory domain when creating VTI guest fails.
If "is_vti" is not set at that point, HV will call relinquish_vcpu_resource(),
which is for non-VTI. It may try to free a NULL pointer, so dom0 crash.
This patch fix it.

Signed-off-by: Xu Anthony <Anthony.xu@xxxxxxxxx>
Signed-off-by: Zhang Xin <xing.z.zhang@xxxxxxxxx>
---
 xen/arch/ia64/xen/vhpt.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)

diff -r b59b6173455d -r 10dd3c907ca7 xen/arch/ia64/xen/vhpt.c
--- a/xen/arch/ia64/xen/vhpt.c  Tue Jan 23 12:01:38 2007 -0700
+++ b/xen/arch/ia64/xen/vhpt.c  Tue Jan 23 12:07:02 2007 -0700
@@ -177,7 +177,9 @@ void
 void
 pervcpu_vhpt_free(struct vcpu *v)
 {
-       free_domheap_pages(v->arch.vhpt_page, VHPT_SIZE_LOG2 - PAGE_SHIFT);
+       if (likely(v->arch.vhpt_page != NULL))
+               free_domheap_pages(v->arch.vhpt_page,
+                                  VHPT_SIZE_LOG2 - PAGE_SHIFT);
 }
 #endif
 

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