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: Bill C Riemers <briemers@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 16 insertions, 2 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index ba2da11a997b..17258feaab9b 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -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);