linux-kernel - [PATCH 4.9 14/92] cfg80211: initialize on-stack chandefs

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Message-Id: <20191016214811.372948112@linuxfoundation.org>
Date:   Wed, 16 Oct 2019 14:49:47 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dmitry Osipenko <digetx@...il.com>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 4.9 14/92] cfg80211: initialize on-stack chandefs

From: Johannes Berg <johannes.berg@...el.com>

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@...r.kernel.org
Fixes: 2a38075cd0be ("nl80211: Add support for EDMG channels")
Reported-by: Dmitry Osipenko <digetx@...il.com>
Tested-by: Dmitry Osipenko <digetx@...il.com>
Link: https://lore.kernel.org/r/1569239475-I2dcce394ecf873376c386a78f31c2ec8b538fa25@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/wireless/nl80211.c     |    4 +++-
 net/wireless/reg.c         |    2 +-
 net/wireless/wext-compat.c |    2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2069,6 +2069,8 @@ static int nl80211_parse_chandef(struct
 
 	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_
 
 	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) {
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1564,7 +1564,7 @@ static void reg_call_notifier(struct wip
 
 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;
 
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -799,7 +799,7 @@ static int cfg80211_wext_giwfreq(struct
 {
 	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) {