evaluate: clone unary expression datatype to deal with dynamic datatype

When allocating a unary expression, clone the datatype to deal with
dynamic datatypes.

Fixes: 6b01bb9ff798 ("datatype: concat expression only releases dynamically allocated datatype")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/shell/testcases/maps/dumps/vmap_unary.nft b/tests/shell/testcases/maps/dumps/vmap_unary.nft
new file mode 100644
index 00000000..46c538b7
--- /dev/null
+++ b/tests/shell/testcases/maps/dumps/vmap_unary.nft
@@ -0,0 +1,11 @@
+table ip filter {
+	map ipsec_in {
+		typeof ipsec in reqid . iif : verdict
+		flags interval
+	}
+
+	chain INPUT {
+		type filter hook input priority filter; policy drop;
+		ipsec in reqid . iif vmap @ipsec_in
+	}
+}