expression: define .clone for catchall set element

Otherwise reuse of catchall set element expression in variable triggers
a null-pointer dereference.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/shell/testcases/maps/0017_map_variable_0 b/tests/shell/testcases/maps/0017_map_variable_0
new file mode 100755
index 00000000..70cea88d
--- /dev/null
+++ b/tests/shell/testcases/maps/0017_map_variable_0
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -e
+
+RULESET="define x = {
+        1.1.1.1 : 2,
+        * : 3,
+}
+
+table ip x {
+        map y {
+                typeof ip saddr : mark
+                elements = \$x
+        }
+        map z {
+                typeof ip saddr : mark
+                elements = \$x
+        }
+}"
+
+$NFT -f - <<< "$RULESET"