linux-kernel - [PATCH] mac80211: ocb: skip rx_no_sta when interface is not joined

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Message-ID: <20251216035932.18332-1-moonhee.lee.ca@gmail.com>
Date: Mon, 15 Dec 2025 19:59:32 -0800
From: Moon Hee Lee <moonhee.lee.ca@...il.com>
To: johannes@...solutions.net
Cc: linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	syzbot+b364457b2d1d4e4a3054@...kaller.appspotmail.com,
	netdev@...r.kernel.org,
	syzkaller-bugs@...glegroups.com,
	Moon Hee Lee <moonhee.lee.ca@...il.com>
Subject: [PATCH] mac80211: ocb: skip rx_no_sta when interface is not joined

ieee80211_ocb_rx_no_sta() assumes a valid channel context, which is only
present after JOIN_OCB.

RX may run before JOIN_OCB is executed, in which case the OCB interface
is not operational. Skip RX peer handling when the interface is not
joined to avoid warnings in the RX path.

Reported-by: syzbot+b364457b2d1d4e4a3054@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b364457b2d1d4e4a3054
Tested-by: syzbot+b364457b2d1d4e4a3054@...kaller.appspotmail.com
Signed-off-by: Moon Hee Lee <moonhee.lee.ca@...il.com>
---
 net/mac80211/ocb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mac80211/ocb.c b/net/mac80211/ocb.c
index a5d4358f122a..ebb4f4d88c23 100644
--- a/net/mac80211/ocb.c
+++ b/net/mac80211/ocb.c
@@ -47,6 +47,9 @@ void ieee80211_ocb_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 	struct sta_info *sta;
 	int band;
 
+	if (!ifocb->joined)
+		return;
+
 	/* XXX: Consider removing the least recently used entry and
 	 *      allow new one to be added.
 	 */
-- 
2.43.0