cfg80211: DFS check dfs_region before usage

Check the DFS region before channel availability check.

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 93e3356091ff..9cd8c6113e94 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5651,8 +5651,13 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
         struct net_device *dev = info->user_ptr[1];
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct cfg80211_chan_def chandef;
+        enum nl80211_dfs_regions dfs_region;
         int err;
 
+        dfs_region = reg_get_dfs_region(wdev->wiphy);
+        if (dfs_region == NL80211_DFS_UNSET)
+                return -EINVAL;
+
         err = nl80211_parse_chandef(rdev, info, &chandef);
         if (err)
                 return err;