Patch "mwifiex: MAC randomization should not be persistent" has been added to the 4.9-stable tree

Patch "mwifiex: MAC randomization should not be persistent" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mwifiex: MAC randomization should not be persistent

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mwifiex-mac-randomization-should-not-be-persistent.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 7e2f18f06408ff56d7f75e68de8064777137b319 Mon Sep 17 00:00:00 2001
From: Brian Norris <briannorris@chromium.org>
Date: Wed, 5 Apr 2017 15:26:40 -0700
Subject: mwifiex: MAC randomization should not be persistent

From: Brian Norris <briannorris@chromium.org>

commit 7e2f18f06408ff56d7f75e68de8064777137b319 upstream.

nl80211 provides the NL80211_SCAN_FLAG_RANDOM_ADDR for every scan
request that should be randomized; the absence of such a flag means we
should not randomize. However, mwifiex was stashing the latest
randomization request and *always* using it for future scans, even those
that didn't set the flag.

Let's zero out the randomization info whenever we get a scan request
without NL80211_SCAN_FLAG_RANDOM_ADDR. I'd prefer to remove
priv->random_mac entirely (and plumb the randomization MAC properly
through the call sequence), but the spaghetti is a little difficult to
unravel here for me.

Fixes: c2a8f0ff9c6c ("mwifiex: support random MAC address for scanning")
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/marvell/mwifiex/cfg80211.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
@@ -2512,9 +2512,11 @@ mwifiex_cfg80211_scan(struct wiphy *wiph
 			priv->random_mac[i] |= get_random_int() &
 					       ~(request->mac_addr_mask[i]);
 		}
+		ether_addr_copy(user_scan_cfg->random_mac, priv->random_mac);
+	} else {
+		eth_zero_addr(priv->random_mac);
 	}
 
-	ether_addr_copy(user_scan_cfg->random_mac, priv->random_mac);
 	user_scan_cfg->num_ssids = request->n_ssids;
 	user_scan_cfg->ssid_list = request->ssids;
 


Patches currently in stable-queue which might be from briannorris@chromium.org are

queue-4.9/mwifiex-mac-randomization-should-not-be-persistent.patch
queue-4.9/mwifiex-pcie-fix-cmd_buf-use-after-free-in-remove-reset.patch