[PATCH 4.19 70/89] batman-adv: Dont schedule OGM for disabled interface

[Greg Kroah-Hartman]

From: Sven Eckelmann <sven@xxxxxxxxxxxxx>

commit 8e8ce08198de193e3d21d42e96945216e3d9ac7f upstream.

A transmission scheduling for an interface which is currently dropped by
batadv_iv_ogm_iface_disable could still be in progress. The B.A.T.M.A.N. V
is simply cancelling the workqueue item in an synchronous way but this is
not possible with B.A.T.M.A.N. IV because the OGM submissions are
intertwined.

Instead it has to stop submitting the OGM when it detect that the buffer
pointer is set to NULL.

Reported-by: syzbot+a98f2016f40b9cd3818a@xxxxxxxxxxxxxxxxxxxxxxxxx
Reported-by: syzbot+ac36b6a33c28a491e929@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: c6c8fea29769 ("net: Add batman-adv meshing protocol")
Signed-off-by: Sven Eckelmann <sven@xxxxxxxxxxxxx>
Cc: Hillf Danton <hdanton@xxxxxxxx>
Signed-off-by: Simon Wunderlich <sw@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/batman-adv/bat_iv_ogm.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -970,6 +970,10 @@ static void batadv_iv_ogm_schedule_buff(
 
 	lockdep_assert_held(&hard_iface->bat_iv.ogm_buff_mutex);
 
+	/* interface already disabled by batadv_iv_ogm_iface_disable */
+	if (!*ogm_buff)
+		return;
+
 	/* the interface gets activated here to avoid race conditions between
 	 * the moment of activating the interface in
 	 * hardif_activate_interface() where the originator mac is set and