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wifi: mt76: mt7925: prevent NULL vif dereference in mt7925_mac_write_txwi

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Check for a NULL `vif` before accessing `ieee80211_vif_is_mld(vif)` to
avoid a potential kernel panic in scenarios where `vif` might not be
initialized.

Fixes: ebb1406813 ("wifi: mt76: mt7925: add link handling to txwi")
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Link: https://patch.msgid.link/20250904030649.655436-3-mingyen.hsieh@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Ming Yen Hsieh 2025-09-04 11:06:47 +08:00 committed by Felix Fietkau
parent 83ae3a18ba
commit 962eb04e67
1 changed files with 2 additions and 2 deletions
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4
drivers/net/wireless/mediatek/mt76/mt7925/mac.c
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@ -804,8 +804,8 @@ mt7925_mac_write_txwi(struct mt76_dev *dev, __le32 *txwi,
txwi[5] = cpu_to_le32(val);
val = MT_TXD6_DAS | FIELD_PREP(MT_TXD6_MSDU_CNT, 1);
if (!ieee80211_vif_is_mld(vif) ||
(q_idx >= MT_LMAC_ALTX0 && q_idx <= MT_LMAC_BCN0))
if (vif && (!ieee80211_vif_is_mld(vif) ||
(q_idx >= MT_LMAC_ALTX0 && q_idx <= MT_LMAC_BCN0)))
val |= MT_TXD6_DIS_MAT;
txwi[6] = cpu_to_le32(val);
txwi[7] = 0;