From 3d9646d0abd02c552f6f15c302b31aa321c2fa8b Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Sat, 9 Feb 2013 21:46:34 +0100 Subject: [PATCH] mac80211: fix channel selection bug When trying to connect to an AP that advertises HT but not VHT, the mac80211 code erroneously uses the configuration from the AP as is instead of checking it against regulatory and local capabilities. This can lead to using an invalid or even inexistent channel (like 11/HT40+). Additionally, the return flags from downgrading must be ORed together, to collect them from all of the downgrades. Also clarify the message. Signed-off-by: Johannes Berg --- net/mac80211/mlme.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 3b9cb510aa3..5107248af7f 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -3400,6 +3400,7 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, ret = 0; +out: while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, IEEE80211_CHAN_DISABLED)) { if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) { @@ -3408,14 +3409,13 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, goto out; } - ret = chandef_downgrade(chandef); + ret |= chandef_downgrade(chandef); } if (chandef->width != vht_chandef.width) sdata_info(sdata, - "local regulatory prevented using AP HT/VHT configuration, downgraded\n"); + "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n"); -out: WARN_ON_ONCE(!cfg80211_chandef_valid(chandef)); return ret; }