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[2/2] KVM: Prevent overflow in largepages calculation

Message ID 1244466010-24909-3-git-send-email-avi@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Avi Kivity June 8, 2009, 1 p.m. UTC
If userspace specifies a memory slot that is larger than 8 petabytes, it
could overflow the largepages variable.

Signed-off-by: Avi Kivity <avi@redhat.com>
 virt/kvm/kvm_main.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
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diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b9ca73c..669eb4a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1087,8 +1087,7 @@  int __kvm_set_memory_region(struct kvm *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;