cfg80211: initialize on-stack chandefs

commit f43e5210c739fe76a4b0ed851559d6902f20ceb1 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d6e6293..c613be6 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2069,6 +2069,8 @@ static int nl80211_parse_chandef(struct cfg80211_registered_device *rdev,
 
        control_freq = nla_get_u32(info->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;
@@ -2538,7 +2540,7 @@ 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 d137834..44befe9 100644 (file)
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1564,7 +1564,7 @@ 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 a220156..b3baa34 100644 (file)
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -799,7 +799,7 @@ 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) {