KVM: Prevent overflow in largepages calculation
If userspace specifies a memory slot that is larger than 8 petabytes, it
could overflow the largepages variable.
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5f865ed..e211945 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1087,8 +1087,7 @@
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;
