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-rw-r--r--virt/kvm/coalesced_mmio.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index a6ec206f36ba..88b2fe3ddf42 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -28,9 +28,15 @@ static int coalesced_mmio_in_range(struct kvm_coalesced_mmio_dev *dev,
* (addr,len) is fully included in
* (zone->addr, zone->size)
*/
-
- return (dev->zone.addr <= addr &&
- addr + len <= dev->zone.addr + dev->zone.size);
+ if (len < 0)
+ return 0;
+ if (addr + len < addr)
+ return 0;
+ if (addr < dev->zone.addr)
+ return 0;
+ if (addr + len > dev->zone.addr + dev->zone.size)
+ return 0;
+ return 1;
}
static int coalesced_mmio_has_room(struct kvm_coalesced_mmio_dev *dev)