mac80211: choose first enabled channel for monitor

[ Upstream commit 041c881a0ba8a75f71118bd9766b78f04beed469 ]

Even if the first channel from sband channel list is invalid
or disabled mac80211 ends up choosing it as the default channel
for monitor interfaces, making them not usable.

Fix this by assigning the first available valid or enabled
channel instead.

Signed-off-by: Karthikeyan Kathirvel <kathirve@codeaurora.org>
Link: https://lore.kernel.org/r/1615440547-7661-1-git-send-email-kathirve@codeaurora.org
[reword commit message, comment, code cleanups]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 68db2a356443188e9aa36c573bd4c149802d1a35..f44d00f35fe7bb83f32d64d008f85d5076ab9c8e 100644 (file)
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -931,8 +931,19 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
                        continue;
 
                if (!dflt_chandef.chan) {
+                       /*
+                        * Assign the first enabled channel to dflt_chandef
+                        * from the list of channels
+                        */
+                       for (i = 0; i < sband->n_channels; i++)
+                               if (!(sband->channels[i].flags &
+                                               IEEE80211_CHAN_DISABLED))
+                                       break;
+                       /* if none found then use the first anyway */
+                       if (i == sband->n_channels)
+                               i = 0;
                        cfg80211_chandef_create(&dflt_chandef,
-                                               &sband->channels[0],
+                                               &sband->channels[i],
                                                NL80211_CHAN_NO_HT);
                        /* init channel we're on */
                        if (!local->use_chanctx && !local->_oper_chandef.chan) {