Commit 05cb9108 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

mac80211: disable powersave for broken APs 



Only AID values 1-2007 are valid, but some APs have been
found to send random bogus values, in the reported case an
AP that was sending the AID field value 0xffff, an AID of
0x3fff (16383).

There isn't much we can do but disable powersave since
there's no way it can work properly in this case.

Cc: stable@vger.kernel.org
Reported-by: default avatarBill C Riemers <briemers@redhat.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 8a39ef8b

net/mac80211/ieee80211_i.h

+1 −0
Original line number Diff line number Diff line
@@ -389,6 +389,7 @@ struct ieee80211_if_managed { 


	unsigned long timers_running; /* used for quiesce/restart */

	bool powersave; /* powersave requested for this iface */

	bool broken_ap; /* AP is broken -- turn off powersave */

	enum ieee80211_smps_mode req_smps, /* requested smps mode */

				 ap_smps, /* smps mode AP thinks we're in */

				 driver_smps_mode; /* smps mode request */

net/mac80211/mlme.c

+16 −2
Original line number Diff line number Diff line
@@ -637,6 +637,9 @@ static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 
	if (!mgd->powersave)

		return false;



	if (mgd->broken_ap)

		return false;



	if (!mgd->associated)

		return false;
@@ -1489,10 +1492,21 @@ static bool ieee80211_assoc_success(struct ieee80211_work *wk, 
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);



	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))

		printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "

		       "set\n", sdata->name, aid);

		printk(KERN_DEBUG

		       "%s: invalid AID value 0x%x; bits 15:14 not set\n",

		       sdata->name, aid);

	aid &= ~(BIT(15) | BIT(14));



	ifmgd->broken_ap = false;



	if (aid == 0 || aid > IEEE80211_MAX_AID) {

		printk(KERN_DEBUG

		       "%s: invalid AID value %d (out of range), turn off PS\n",

		       sdata->name, aid);

		aid = 0;

		ifmgd->broken_ap = true;

	}



	pos = mgmt->u.assoc_resp.variable;

	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);

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