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wifi: mac80211: potential NULL dereference in ieee80211_tx_control_port() 

The ieee80211_lookup_ra_sta() function will sometimes set "sta" to NULL
so add this NULL check to prevent an Oops.

Fixes: 9dd1953846 ("wifi: nl80211/mac80211: clarify link ID in control port TX")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/YuKcTAyO94YOy0Bu@kili
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Dan Carpenter 2022-07-28 17:25:16 +03:00 committed by Johannes Berg
parent d776763f48
commit 55f0a48944
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/tx.c
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@ -5900,7 +5900,7 @@ int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
* for MLO STA, the SA should be the AP MLD address, but
* the link ID has been selected already
*/
if (sta->sta.mlo)
if (sta && sta->sta.mlo)
memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
}
rcu_read_unlock();