Patch "mac80211_hwsim: Add missing check for HWSIM_ATTR_SIGNAL" has been added to the 4.4-stable tree

Patch "mac80211_hwsim: Add missing check for HWSIM_ATTR_SIGNAL" has been added to the 4.4-stable tree

[gregkh]

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

    mac80211_hwsim: Add missing check for HWSIM_ATTR_SIGNAL

to the 4.4-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:
     mac80211_hwsim-add-missing-check-for-hwsim_attr_signal.patch
and it can be found in the queue-4.4 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 62397da50bb20a6b812c949ef465d7e69fe54bb6 Mon Sep 17 00:00:00 2001
From: Martin Willi <martin@strongswan.org>
Date: Fri, 13 May 2016 12:41:48 +0200
Subject: mac80211_hwsim: Add missing check for HWSIM_ATTR_SIGNAL

From: Martin Willi <martin@strongswan.org>

commit 62397da50bb20a6b812c949ef465d7e69fe54bb6 upstream.

A wmediumd that does not send this attribute causes a NULL pointer
dereference, as the attribute is accessed even if it does not exist.

The attribute was required but never checked ever since userspace frame
forwarding has been introduced. The issue gets more problematic once we
allow wmediumd registration from user namespaces.

Fixes: 7882513bacb1 ("mac80211_hwsim driver support userspace frame tx/rx")
Signed-off-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/mac80211_hwsim.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -2723,6 +2723,7 @@ static int hwsim_tx_info_frame_received_
 	if (!info->attrs[HWSIM_ATTR_ADDR_TRANSMITTER] ||
 	    !info->attrs[HWSIM_ATTR_FLAGS] ||
 	    !info->attrs[HWSIM_ATTR_COOKIE] ||
+	    !info->attrs[HWSIM_ATTR_SIGNAL] ||
 	    !info->attrs[HWSIM_ATTR_TX_INFO])
 		goto out;
 


Patches currently in stable-queue which might be from martin@strongswan.org are

queue-4.4/mac80211_hwsim-add-missing-check-for-hwsim_attr_signal.patch