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mac80211: fix locking in ieee80211_start_ap error path

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commit 87a270625a89fc841f1a7e21aae6176543d8385c upstream.

We need to hold the local->mtx to release the channel context,
as even encoded by the lockdep_assert_held() there. Fix it.

Cc: stable@vger.kernel.org
Fixes: 295b02c4be ("mac80211: Add FILS discovery support")
Reported-and-tested-by: syzbot+11c342e5e30e9539cabd@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20211220090836.cee3d59a1915.I36bba9b79dc2ff4d57c3c7aa30dff9a003fe8c5c@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Berg 2021-12-20 10:22:40 +01:00 committed by Greg Kroah-Hartman
parent 89876d1083
commit ac61b9c6c0
1 changed files with 3 additions and 0 deletions
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3
net/mac80211/cfg.c
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@ -1217,7 +1217,10 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
return 0;
error:
mutex_lock(&local->mtx);
ieee80211_vif_release_channel(sdata);
mutex_unlock(&local->mtx);
return err;
}