cfg80211: Acquire wiphy mutex on regulatory work

The function cfg80211_reg_can_beacon_relax() expects wiphy
mutex to be held when it is being called. However, when
reg_leave_invalid_chans() is called the mutex is not held.
Fix it by acquiring the lock before calling the function.

Fixes: a05829a7222e ("cfg80211: avoid holding the RTNL when calling the driver")
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211202152831.527686cda037.I40ad9372a47cbad53b4aae7b5a6ccc0dc3fddf8b@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 8148a3b..f8f01a3 100644 (file)
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -2359,6 +2359,7 @@ static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
        struct cfg80211_chan_def chandef = {};
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
        enum nl80211_iftype iftype;
+       bool ret;
 
        wdev_lock(wdev);
        iftype = wdev->iftype;
@@ -2408,7 +2409,11 @@ static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_P2P_GO:
        case NL80211_IFTYPE_ADHOC:
-               return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
+               wiphy_lock(wiphy);
+               ret = cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
+               wiphy_unlock(wiphy);
+
+               return ret;
        case NL80211_IFTYPE_STATION:
        case NL80211_IFTYPE_P2P_CLIENT:
                return cfg80211_chandef_usable(wiphy, &chandef,