cfg80211: initialize on-stack chandefs

In a few places we don't properly initialize on-stack chandefs,
resulting in EDMG data to be non-zero, which broke things.

Additionally, in a few places we rely on the driver to init the
data completely, but perhaps we shouldn't as non-EDMG drivers
may not initialize the EDMG data, also initialize it there.

Cc: stable@vger.kernel.org
Fixes: 2a38075cd0be ("nl80211: Add support for EDMG channels")
Reported-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/1569239475-I2dcce394ecf873376c386a78f31c2ec8b538fa25@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 5 insertions, 3 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 7386421e2ad3..10617566a117 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2669,6 +2669,8 @@ int nl80211_parse_chandef(struct cfg80211_registered_device *rdev,
 
         control_freq = nla_get_u32(attrs[NL80211_ATTR_WIPHY_FREQ]);
 
+        memset(chandef, 0, sizeof(*chandef));
+
         chandef->chan = ieee80211_get_channel(&rdev->wiphy, control_freq);
         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
         chandef->center_freq1 = control_freq;
@@ -3209,7 +3211,7 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
 
         if (rdev->ops->get_channel) {
                 int ret;
-                struct cfg80211_chan_def chandef;
+                struct cfg80211_chan_def chandef = {};
 
                 ret = rdev_get_channel(rdev, wdev, &chandef);
                 if (ret == 0) {
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 5311d0ae2454..420c4207ab59 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -2108,7 +2108,7 @@ static void reg_call_notifier(struct wiphy *wiphy,
 
 static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
 {
-        struct cfg80211_chan_def chandef;
+        struct cfg80211_chan_def chandef = {};
         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
         enum nl80211_iftype iftype;
 
diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index 7b6529d81c61..cac9e28d852b 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -798,7 +798,7 @@ static int cfg80211_wext_giwfreq(struct net_device *dev,
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
-        struct cfg80211_chan_def chandef;
+        struct cfg80211_chan_def chandef = {};
         int ret;
 
         switch (wdev->iftype) {