4.17-stable review patch. If anyone has any objections, please let me know.
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From: Sven Eckelmann sven@narfation.org
[ Upstream commit b5685d2687d6612adf5eac519eb7008f74dfd1ec ]
A reference for the best gateway is taken when the list of gateways in the mesh is sent via netlink. This is necessary to check whether the currently dumped entry is the currently selected gateway or not. This information is then transferred as flag BATADV_ATTR_FLAG_BEST.
After the comparison of the current entry is done, batadv_iv_gw_dump_entry() has to decrease the reference counter again. Otherwise the reference will be held and thus prevents a proper shutdown of the batman-adv interfaces (and some of the interfaces enslaved in it).
Fixes: efb766af06e3 ("batman-adv: add B.A.T.M.A.N. IV bat_gw_dump implementations") Reported-by: Andreas Ziegler dev@andreas-ziegler.de Tested-by: Andreas Ziegler dev@andreas-ziegler.de Signed-off-by: Sven Eckelmann sven@narfation.org Acked-by: Marek Lindner mareklindner@neomailbox.ch Signed-off-by: Simon Wunderlich sw@simonwunderlich.de Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/batman-adv/bat_iv_ogm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -2732,7 +2732,7 @@ 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; + struct batadv_gw_node *curr_gw = NULL; int ret = 0; void *hdr;
@@ -2780,6 +2780,8 @@ static int batadv_iv_gw_dump_entry(struc ret = 0;
out: + if (curr_gw) + batadv_gw_node_put(curr_gw); if (router_ifinfo) batadv_neigh_ifinfo_put(router_ifinfo); if (router)