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wifi: mt76: mt7925: guard link STA in decap offload

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mt7925_sta_set_decap_offload() iterates over the vif valid_links mask
when updating decap offload state for an MLO station. The station may not
have a link STA for every valid link of the vif, so mt792x_sta_to_link()
can return NULL for a link that belongs to the vif but not to the station.

The function currently dereferences mlink before checking whether the
link WCID is ready. If mlink is NULL, setting or clearing
MT_WCID_FLAG_HDR_TRANS dereferences a NULL pointer.

Skip links without a station link before touching mlink->wcid.

Fixes: b859ad6530 ("wifi: mt76: mt7925: add link handling in mt7925_sta_set_decap_offload")
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
Link: https://patch.msgid.link/20260708075539.726200-1-lgs201920130244@gmail.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Guangshuo Li 2026-07-08 15:55:39 +08:00 committed by Felix Fietkau
parent 13b7e6a96a
commit 96ea44f226
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wireless/mediatek/mt76/mt7925/main.c
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@ -1713,6 +1713,9 @@ static void mt7925_sta_set_decap_offload(struct ieee80211_hw *hw,
mconf = mt792x_vif_to_link(mvif, i);
mlink = mt792x_sta_to_link(msta, i);
if (!mlink)
continue;
if (enabled)
set_bit(MT_WCID_FLAG_HDR_TRANS, &mlink->wcid.flags);
else