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Commit 2967e031 authored by Felix Fietkau's avatar Felix Fietkau Committed by Johannes Berg
Browse files

mac80211: copy chandef from AP vif to VLANs 



Instead of keeping track of all those special cases where
VLAN interfaces have no bss_conf.chandef, just make sure
they have the same as the AP interface they belong to.

Among others, this fixes a crash getting a VLAN's channel
from userspace since a NULL channel is returned as a good
result (return value 0) for VLANs since the commit below.

Cc: stable@vger.kernel.org [3.18 only]
Fixes: c12bc488 ("mac80211: return the vif's chandef in ieee80211_cfg_get_channel()")
Signed-off-by: default avatarFelix Fietkau <nbd@openwrt.org>
[rewrite commit log]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 601555cd

net/mac80211/chan.c

+19 −4
Original line number Diff line number Diff line
@@ -932,6 +932,21 @@ ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata) 
	}

}



static void

ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,

			     const struct cfg80211_chan_def *chandef)

{

	struct ieee80211_sub_if_data *vlan;



	sdata->vif.bss_conf.chandef = *chandef;



	if (sdata->vif.type != NL80211_IFTYPE_AP)

		return;



	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)

		vlan->vif.bss_conf.chandef = *chandef;

}



static int

ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)

{
@@ -994,7 +1009,7 @@ ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata) 
	if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)

		changed = BSS_CHANGED_BANDWIDTH;



	sdata->vif.bss_conf.chandef = sdata->reserved_chandef;

	ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);



	if (changed)

		ieee80211_bss_info_change_notify(sdata, changed);
@@ -1336,7 +1351,7 @@ static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 
			    sdata->reserved_chandef.width)

				changed = BSS_CHANGED_BANDWIDTH;



			sdata->vif.bss_conf.chandef = sdata->reserved_chandef;

			ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);

			if (changed)

				ieee80211_bss_info_change_notify(sdata,

								 changed);
@@ -1507,7 +1522,7 @@ int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, 
		goto out;

	}



	sdata->vif.bss_conf.chandef = *chandef;

	ieee80211_vif_update_chandef(sdata, chandef);



	ret = ieee80211_assign_vif_chanctx(sdata, ctx);

	if (ret) {
@@ -1649,7 +1664,7 @@ int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata, 
		break;

	}



	sdata->vif.bss_conf.chandef = *chandef;

	ieee80211_vif_update_chandef(sdata, chandef);



	ieee80211_recalc_chanctx_chantype(local, ctx);

net/mac80211/iface.c

+1 −0
Original line number Diff line number Diff line
@@ -520,6 +520,7 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 
		sdata->vif.cab_queue = master->vif.cab_queue;

		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,

		       sizeof(sdata->vif.hw_queue));

		sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;

		break;

		}

	case NL80211_IFTYPE_AP: