libnftables: don't crash when no commands are specified

For e.g.  nft -c "  "
Without this patch it segfaults.

Signed-off-by: Harsha Sharma <harshasharmaiitr@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/libnftables.c b/src/libnftables.c
index c86d8947..1d1975e9 100644
--- a/src/libnftables.c
+++ b/src/libnftables.c
@@ -30,6 +30,9 @@ static int nft_netlink(struct nft_ctx *nft,
 	bool batch_supported = netlink_batch_supported(nf_sock, &seqnum);
 	int ret = 0;
 
+	if (list_empty(&state->cmds))
+		return 0;
+
 	batch = mnl_batch_init();
 
 	batch_seqnum = mnl_batch_begin(batch, mnl_seqnum_alloc(&seqnum));