cfg80211: protect beacon changing functions with wdev-lock

To avoid race conditions in functions which modify the beacon
information, lock these using the wdev lock. This is especially required
to avoid problems for csa handling functions which modify beacons but
can not be called under rtnl lock.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 703155b1aa7a5139c7c8dc68248f96d24f94957d..398756c226c36e43def3aff5fdffef769163208c 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3218,6 +3218,7 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
                        return PTR_ERR(params.acl);
        }
 
+       wdev_lock(wdev);
        err = rdev_start_ap(rdev, dev, &params);
        if (!err) {
                wdev->preset_chandef = params.chandef;
@@ -3226,6 +3227,7 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
                wdev->ssid_len = params.ssid_len;
                memcpy(wdev->ssid, params.ssid, wdev->ssid_len);
        }
+       wdev_unlock(wdev);
 
        kfree(params.acl);
 
@@ -3254,7 +3256,11 @@ static int nl80211_set_beacon(struct sk_buff *skb, struct genl_info *info)
        if (err)
                return err;
 
-       return rdev_change_beacon(rdev, dev, &params);
+       wdev_lock(wdev);
+       err = rdev_change_beacon(rdev, dev, &params);
+       wdev_unlock(wdev);
+
+       return err;
 }
 
 static int nl80211_stop_ap(struct sk_buff *skb, struct genl_info *info)
@@ -4460,7 +4466,9 @@ static int nl80211_set_bss(struct sk_buff *skb, struct genl_info *info)
 {
        struct cfg80211_registered_device *rdev = info->user_ptr[0];
        struct net_device *dev = info->user_ptr[1];
+       struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct bss_parameters params;
+       int err;
 
        memset(&params, 0, sizeof(params));
        /* default to not changing parameters */
@@ -4526,7 +4534,11 @@ static int nl80211_set_bss(struct sk_buff *skb, struct genl_info *info)
            dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO)
                return -EOPNOTSUPP;
 
-       return rdev_change_bss(rdev, dev, &params);
+       wdev_lock(wdev);
+       err = rdev_change_bss(rdev, dev, &params);
+       wdev_unlock(wdev);
+
+       return err;
 }
 
 static const struct nla_policy reg_rule_policy[NL80211_REG_RULE_ATTR_MAX + 1] = {
@@ -5791,7 +5803,11 @@ skip_beacons:
        if (info->attrs[NL80211_ATTR_CH_SWITCH_BLOCK_TX])
                params.block_tx = true;
 
-       return rdev_channel_switch(rdev, dev, &params);
+       wdev_lock(wdev);
+       err = rdev_channel_switch(rdev, dev, &params);
+       wdev_unlock(wdev);
+
+       return err;
 }
 
 static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb,