Commit 0300545b authored by Felix Fietkau's avatar Felix Fietkau
Browse files

wifi: mt76: mt7996: fix crash on some tx status reports 

When a wcid can't be found, link_sta can be stale from a previous batch.
The code currently assumes that if link_sta is set, wcid is also non-zero.
Fix wcid NULL pointer dereference by resetting link_sta when a wcid entry
can't be found.

Fixes: 62da647a ("wifi: mt76: mt7996: Add MLO support to mt7996_tx_check_aggr()")
Link: https://patch.msgid.link/20250827085352.51636-1-nbd@nbd.name


Signed-off-by: default avatarFelix Fietkau <nbd@nbd.name>
parent 4be3b46e

drivers/net/wireless/mediatek/mt76/mt7996/mac.c

+3 −1
Original line number Diff line number Diff line
@@ -1247,8 +1247,10 @@ mt7996_mac_tx_free(struct mt7996_dev *dev, void *data, int len) 
			idx = FIELD_GET(MT_TXFREE_INFO_WLAN_ID, info);

			wcid = mt76_wcid_ptr(dev, idx);

			sta = wcid_to_sta(wcid);

			if (!sta)

			if (!sta) {

				link_sta = NULL;

				goto next;

			}



			link_sta = rcu_dereference(sta->link[wcid->link_id]);

			if (!link_sta)