Received-SPF: pass (google.com: domain of linux-wireless-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Johannes Berg <johannes@sipsolutions.net>
To:     linux-wireless@vger.kernel.org
Cc:     Johannes Berg <johannes.berg@intel.com>,
        syzbot+7716dbc401d9a437890d@syzkaller.appspotmail.com
Subject: [PATCH] mac80211: remove warning in ieee80211_get_sband()
Date:   Mon, 17 May 2021 16:47:17 +0200
Message-Id: <20210517164715.f537da276d17.Id05f40ec8761d6a8cc2df87f1aa09c651988a586@changeid>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Johannes Berg <johannes.berg@intel.com>

Syzbot reports that it's possible to hit this from userspace,
by trying to add a station before any other connection setup
has been done. Instead of trying to catch this in some other
way simply remove the warning, that will appropriately reject
the call from userspace.

Reported-by: syzbot+7716dbc401d9a437890d@syzkaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 net/mac80211/ieee80211_i.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 214404a558fb..648696b49f89 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1442,7 +1442,7 @@ ieee80211_get_sband(struct ieee80211_sub_if_data *sdata)
 	rcu_read_lock();
 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 
-	if (WARN_ON_ONCE(!chanctx_conf)) {
+	if (!chanctx_conf) {
 		rcu_read_unlock();
 		return NULL;
 	}
-- 
2.31.1