mac80211: avoid using uninitialized stack data

Avoid a case where we would access uninitialized stack data if the AP
advertises HT support without 40MHz channel support.

Cc: stable@vger.kernel.org
Fixes: f3000e1b43f1 ("mac80211: fix broken use of VHT/20Mhz with some APs")
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 75a9bf50207e..2c36c4765f47 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -174,6 +174,7 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
         if (!(ht_cap->cap_info &
               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
                 ret = IEEE80211_STA_DISABLE_40MHZ;
+                vht_chandef = *chandef;
                 goto out;
         }