wifi: mt76: mt7996: fix out-of-bounds link array access in mt7996_tx()

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When mac80211 leaves the link unspecified, mt7996_tx() substitutes the
primary link id of the station or vif. That value is
IEEE80211_LINK_UNSPECIFIED (0xf) until the first link has been added,
and it is then used unchecked to index vif->link_conf[],
mvif->mt76.link[] and sta->link[], all of which hold
IEEE80211_MLD_MAX_NUM_LINKS (15) entries.

Clamp the primary link id to the default link before using it, and use
the clamped value for the link_sta fallback as well.

Fixes: 1609b014aa ("wifi: mt76: mt7996: Overwrite unspecified link_id in mt7996_tx()")
Link: https://patch.msgid.link/20260801145334.1166751-10-nbd@nbd.name
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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Felix Fietkau 2026-08-01 14:53:34 +00:00

parent 9ba744a28c

commit 4330a0ef9f

1 changed files with 13 additions and 7 deletions

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

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