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Subject[PATCH 4.14 148/496] batman-adv: Ignore invalid batadv_v_gw during netlink send
4.14-stable review patch.  If anyone has any objections, please let me know.


From: Sven Eckelmann <>

[ Upstream commit 011c935fceae5252619ef730baa610c655281dda ]

The function batadv_v_gw_dump stops the processing loop when
batadv_v_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: b71bb6f924fe ("batman-adv: add B.A.T.M.A.N. V bat_gw_dump implementations")
Signed-off-by: Sven Eckelmann <>
Signed-off-by: Simon Wunderlich <>
Signed-off-by: Sasha Levin <>
Signed-off-by: Greg Kroah-Hartman <>
net/batman-adv/bat_v.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/batman-adv/bat_v.c
+++ b/net/batman-adv/bat_v.c
@@ -930,7 +930,7 @@ static int batadv_v_gw_dump_entry(struct
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);

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