6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johannes Berg <johannes.berg@xxxxxxxxx>
[ Upstream commit a26787aa13974fb0b3fb42bfeb4256c1b686e305 ]
We want to ensure everything holds the wiphy lock,
so also extend that to the MAC change callback.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Stable-dep-of: 74a7c93f45ab ("wifi: mac80211: fix change_address deadlock during unregister")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/mac80211/iface.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 6e3bfb46af44d..9ac5252c3da00 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -251,9 +251,9 @@ static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata
return ret;
}
-static int ieee80211_change_mac(struct net_device *dev, void *addr)
+static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
+ void *addr)
{
- struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sockaddr *sa = addr;
bool check_dup = true;
@@ -278,7 +278,7 @@ static int ieee80211_change_mac(struct net_device *dev, void *addr)
if (live)
drv_remove_interface(local, sdata);
- ret = eth_mac_addr(dev, sa);
+ ret = eth_mac_addr(sdata->dev, sa);
if (ret == 0) {
memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
@@ -294,6 +294,19 @@ static int ieee80211_change_mac(struct net_device *dev, void *addr)
return ret;
}
+static int ieee80211_change_mac(struct net_device *dev, void *addr)
+{
+ struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+ struct ieee80211_local *local = sdata->local;
+ int ret;
+
+ wiphy_lock(local->hw.wiphy);
+ ret = _ieee80211_change_mac(sdata, addr);
+ wiphy_unlock(local->hw.wiphy);
+
+ return ret;
+}
+
static inline int identical_mac_addr_allowed(int type1, int type2)
{
return type1 == NL80211_IFTYPE_MONITOR ||
--
2.43.0
