evaluate: stmt_nat: set reference must point to a map

nat_concat_map() requires a datamap, else we crash:
set->data is dereferenced.

Also update expr_evaluate_map() so that EXPR_SET_REF is checked there
too.

Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/shell/testcases/bogons/nft-f/nat_stmt_with_set_instead_of_map b/tests/shell/testcases/bogons/nft-f/nat_stmt_with_set_instead_of_map
new file mode 100644
index 00000000..b1302278
--- /dev/null
+++ b/tests/shell/testcases/bogons/nft-f/nat_stmt_with_set_instead_of_map
@@ -0,0 +1,10 @@
+table inet x {
+        set y {
+                type ipv4_addr
+                elements = { 2.2.2.2, 3.3.3.3 }
+        }
+
+        chain y {
+                snat ip to ip saddr map @y
+        }
+}