mac80211: don't WARN on bad WMM parameters from buggy APs

Apparently, some APs are buggy enough to send a zeroed
WMM IE. Don't WARN on this since this is not caused by a bug
on the client's system.

This aligns the condition of the WARNING in drv_conf_tx
with the validity check in ieee80211_sta_wmm_params.
We will now pick the default values whenever we get
a zeroed WMM IE.

This has been reported here:
https://bugzilla.kernel.org/show_bug.cgi?id=199161

Fixes: f409079bb678 ("mac80211: sanity check CW_min/CW_max towards driver")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 20d2b18..07b58d2 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1786,7 +1786,8 @@ static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
                params[ac].acm = acm;
                params[ac].uapsd = uapsd;
 
-               if (params[ac].cw_min > params[ac].cw_max) {
+               if (params->cw_min == 0 ||
+                   params[ac].cw_min > params[ac].cw_max) {
                        sdata_info(sdata,
                                   "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
                                   params[ac].cw_min, params[ac].cw_max, aci);