parser_json: fix device parsing in netdev family

json_unpack() function is not designed to take a pre-allocated buffer.

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1612
Fixes: 3fdc7541fba0 ("src: add multidevice support for netdev chain")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/shell/testcases/json/netdev b/tests/shell/testcases/json/netdev
new file mode 100755
index 00000000..a16a4f5e
--- /dev/null
+++ b/tests/shell/testcases/json/netdev
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+ip link add d0 type dummy || {
+        echo "Skipping, no dummy interface available"
+        exit 0
+}
+trap "ip link del d0" EXIT
+
+set -e
+
+$NFT flush ruleset
+$NFT add table inet test
+$NFT add chain inet test c
+
+$NFT flush ruleset
+
+RULESET='{"nftables":[{"flush":{"ruleset":null}},{"add":{"table":{"family":"netdev","name":"test_table"}}},{"add":{"chain":{"family":"netdev","table":"test_table","name":"test_chain","type":"filter","hook":"ingress","prio":0,"dev":"d0","policy":"accept"}}}]}'
+
+$NFT -j -f - <<< $RULESET