diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 3551af9a9453..fd4eb1e561f7 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1839,6 +1839,11 @@ static bool hv_is_vp_in_sparse_set(u32 vp_id, u64 valid_bank_mask, u64 sparse_ba
 	int valid_bit_nr = vp_id / HV_VCPUS_PER_SPARSE_BANK;
 	unsigned long sbank;
 
+	BUILD_BUG_ON(BITS_PER_TYPE(valid_bank_mask) != HV_MAX_SPARSE_VCPU_BANKS);
+
+	if (valid_bit_nr >= HV_MAX_SPARSE_VCPU_BANKS)
+		return false;
+
 	if (!test_bit(valid_bit_nr, (unsigned long *)&valid_bank_mask))
 		return false;