linux-kernel - [PATCH 4.0 095/105] cfg80211: wext: clear sinfo struct before calling driver

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Message-Id: <20150619203601.047130243@linuxfoundation.org>
Date:	Fri, 19 Jun 2015 13:36:25 -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, Gerrit Renker <gerrit@....abdn.ac.uk>,
	Alexander Kaltsas <alexkaltsas@...il.com>,
	Johannes Berg <johannes.berg@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.0 095/105] cfg80211: wext: clear sinfo struct before calling driver

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 9c5a18a31b321f120efda412281bb9f610f84aa0 upstream.

Until recently, mac80211 overwrote all the statistics it could
provide when getting called, but it now relies on the struct
having been zeroed by the caller. This was always the case in
nl80211, but wext used a static struct which could even cause
values from one device leak to another.

Using a static struct is OK (as even documented in a comment)
since the whole usage of this function and its return value is
always locked under RTNL. Not clearing the struct for calling
the driver has always been wrong though, since drivers were
free to only fill values they could report, so calling this
for one device and then for another would always have leaked
values from one to the other.

Fix this by initializing the structure in question before the
driver method call.

This fixes https://bugzilla.kernel.org/show_bug.cgi?id=99691

Reported-by: Gerrit Renker <gerrit@....abdn.ac.uk>
Reported-by: Alexander Kaltsas <alexkaltsas@...il.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/wireless/wext-compat.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -1333,6 +1333,8 @@ static struct iw_statistics *cfg80211_wi
 	memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
 	wdev_unlock(wdev);

+	memset(&sinfo, 0, sizeof(sinfo));
+
 	if (rdev_get_station(rdev, dev, bssid, &sinfo))
 		return NULL;

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