From: Sven Eckelmann Date: Sat, 20 Nov 2021 12:39:39 +0000 (+0100) Subject: batman-adv: Avoid WARN_ON timing related checks X-Git-Tag: v4.4.293~3 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=45011f2973f6b52cf50db397bb27bf805f5f0e7f;p=thirdparty%2Fkernel%2Fstable.git batman-adv: Avoid WARN_ON timing related checks commit 9f460ae31c4435fd022c443a6029352217a16ac1 upstream. The soft/batadv interface for a queued OGM can be changed during the time the OGM was queued for transmission and when the OGM is actually transmitted by the worker. But WARN_ON must be used to denote kernel bugs and not to print simple warnings. A warning can simply be printed using pr_warn. Reported-by: Tetsuo Handa Reported-by: syzbot+c0b807de416427ff3dd1@syzkaller.appspotmail.com Fixes: ef0a937f7a14 ("batman-adv: consider outgoing interface in OGM sending") Signed-off-by: Sven Eckelmann Signed-off-by: Simon Wunderlich [ bp: 4.4 backported: adjust context. ] Signed-off-by: Sven Eckelmann Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index caea5bb38d4b0..6f8d2fe114f65 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -526,8 +526,10 @@ static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) if (WARN_ON(!forw_packet->if_outgoing)) goto out; - if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface)) + if (forw_packet->if_outgoing->soft_iface != soft_iface) { + pr_warn("%s: soft interface switch for queued OGM\n", __func__); goto out; + } if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) goto out;