@@ -1987,6 +1987,8 @@ enum ieee80211_neg_ttlm_res {
* @neg_ttlm: negotiated TID to link mapping info.
* see &struct ieee80211_neg_ttlm.
* @addr: address of this interface
+ * @addr_valid: indicates if the address is actively used. Set to false for
+ * passive monitor interfaces, true in all other cases.
* @p2p: indicates whether this AP or STA interface is a p2p
* interface, i.e. a GO or p2p-sta respectively
* @netdev_features: tx netdev features supported by the hardware for this
@@ -2026,6 +2028,7 @@ struct ieee80211_vif {
u16 valid_links, active_links, dormant_links, suspended_links;
struct ieee80211_neg_ttlm neg_ttlm;
u8 addr[ETH_ALEN] __aligned(2);
+ bool addr_valid;
bool p2p;
u8 cab_queue;
@@ -278,13 +278,8 @@ static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
ret = eth_mac_addr(sdata->dev, sa);
if (ret == 0) {
- if (check_dup) {
- memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
- ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
- } else {
- memset(sdata->vif.addr, 0, ETH_ALEN);
- memset(sdata->vif.bss_conf.addr, 0, ETH_ALEN);
- }
+ memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
+ ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
}
/* Regardless of eth_mac_addr() return we still want to add the
@@ -1323,6 +1318,8 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
}
}
+ sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR ||
+ (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE);
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
/* no need to tell driver, but set carrier and chanctx */
Since adding support for opting out of virtual monitor support, a zero vif addr was used to indicate passive vs active monitor to the driver. This would break the vif->addr when changing the netdev mac address before switching the interface from monitor to sta mode. Fix the regression by adding a separate flag to indicate whether vif->addr is valid. Reported-by: syzbot+9ea265d998de25ac6a46@syzkaller.appspotmail.com Fixes: 9d40f7e32774 ("wifi: mac80211: add flag to opt out of virtual monitor support") Signed-off-by: Felix Fietkau <nbd@nbd.name> --- include/net/mac80211.h | 3 +++ net/mac80211/iface.c | 11 ++++------- 2 files changed, 7 insertions(+), 7 deletions(-)