[PATCH net-next v3 3/7] netconsole: reject enabling a target with no remote IP address

The command-line path already requires a remote address, but if a user
creates a dynamic target and enables it without setting a remote
address, we currently try sending netconsole traffic to "0.0.0.0".

Refuse to enable a target if the remote address is unset.

Reviewed-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Gustavo Luiz Duarte <redacted>
---
 drivers/net/netconsole.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 351754d53cf9..4af4f3039d4c 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c

@@ -483,6 +483,11 @@ static int netcons_netpoll_setup(struct netconsole_target *nt)
 	bool ip_overwritten = false;
 	int err;
 
+	if (nt->remote_ip.family == AF_UNSPEC) {
+		np_err(np, "remote IP address not configured, aborting\n");
+		return -EDESTADDRREQ;
+	}
+
 	rtnl_lock();
 	if (np->dev_name[0])
 		ndev = __dev_get_by_name(net, np->dev_name);

-- 
2.55.0