mac80211: remove warning in ieee80211_get_sband()

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
Link: https://lore.kernel.org/r/20210517164715.f537da276d17.Id05f40ec8761d6a8cc2df87f1aa09c651988a586@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 214404a..648696b 100644 (file)
--- 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;
        }