4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sven Eckelmann <redacted>

[ Upstream commit 10d570284258a30dc104c50787c5289ec49f3d23 ]

The function batadv_iv_gw_dump stops the processing loop when
batadv_iv_gw_dump_entry returns a non-0 return code. This should only
happen when the buffer is full. Otherwise, an empty message may be
returned by batadv_gw_dump. This empty message will then stop the netlink
dumping of gateway entries. At worst, not a single entry is returned to
userspace even when plenty of possible gateways exist.

Fixes: efb766af06e3 ("batman-adv: add B.A.T.M.A.N. IV bat_gw_dump implementations")
Signed-off-by: Sven Eckelmann <redacted>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Sasha Levin <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/batman-adv/bat_iv_ogm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c

@@ -2705,7 +2705,7 @@ static int batadv_iv_gw_dump_entry(struc
 	struct batadv_neigh_ifinfo *router_ifinfo = NULL;
 	struct batadv_neigh_node *router;
 	struct batadv_gw_node *curr_gw;
-	int ret = -EINVAL;
+	int ret = 0;
 	void *hdr;
 
 	router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);