[patch 008/108] KVM: Prevent overflow in largepages calculation

[Greg KH]

2.6.30-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Avi Kivity <avi@xxxxxxxxxx>

commit 09f8ca74ae6c2d78b2c7f6c0751ed0cbe815a3d9 upstream.

If userspace specifies a memory slot that is larger than 8 petabytes, it
could overflow the largepages variable.

Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 virt/kvm/kvm_main.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -920,8 +920,7 @@ int __kvm_set_memory_region(struct kvm *
 	int r;
 	gfn_t base_gfn;
 	unsigned long npages, ugfn;
-	int largepages;
-	unsigned long i;
+	unsigned long largepages, i;
 	struct kvm_memory_slot *memslot;
 	struct kvm_memory_slot old, new;
 


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