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

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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: 62da647a2b ("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: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau
2025-08-27 10:53:47 +02:00
parent 4be3b46ec5
commit 0300545b8a
1 changed files with 3 additions and 1 deletions
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4
drivers/net/wireless/mediatek/mt76/mt7996/mac.c
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@@ -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)