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wifi: mt76: mt7996: Fix possible NULL pointer dereference in mt7996_mac_write_txwi_80211()

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For injected frames (e.g. via radiotap), mac80211 can pass
info->control.vif = NULL, as explicitly noted in struct ieee80211_tx_info.
Check vif pointer before executing ieee80211_vif_is_mld() in
mt7996_mac_write_txwi_80211 routine in order to avoid a possible NULL
pointer dereference.

Fixes: f0b0b239b8 ("wifi: mt76: mt7996: rework mt7996_mac_write_txwi() for MLO support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260531-mt7996_mac_write_txwi_80211-null-ptr-deref-v1-1-6dd38e1d3422@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Lorenzo Bianconi 2026-05-31 11:38:57 +02:00 committed by Felix Fietkau
parent 831074096d
commit 61370e6674
1 changed files with 4 additions and 3 deletions
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7
drivers/net/wireless/mediatek/mt76/mt7996/mac.c
View File

@ -757,6 +757,7 @@ mt7996_mac_write_txwi_80211(struct mt7996_dev *dev, __le32 *txwi,
bool multicast = is_multicast_ether_addr(hdr->addr1);
u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
__le16 fc = hdr->frame_control, sc = hdr->seq_ctrl;
struct ieee80211_vif *vif = info->control.vif;
u16 seqno = le16_to_cpu(sc);
bool hw_bigtk = false;
u8 fc_type, fc_stype;
@ -819,7 +820,7 @@ mt7996_mac_write_txwi_80211(struct mt7996_dev *dev, __le32 *txwi,
txwi[3] |= cpu_to_le32(MT_TXD3_REM_TX_COUNT);
}
if (multicast && ieee80211_vif_is_mld(info->control.vif)) {
if (multicast && vif && ieee80211_vif_is_mld(vif)) {
val = MT_TXD3_SN_VALID |
FIELD_PREP(MT_TXD3_SEQ, IEEE80211_SEQ_TO_SN(seqno));
txwi[3] |= cpu_to_le32(val);
@ -839,12 +840,12 @@ mt7996_mac_write_txwi_80211(struct mt7996_dev *dev, __le32 *txwi,
txwi[3] &= ~cpu_to_le32(MT_TXD3_HW_AMSDU);
}
if (ieee80211_vif_is_mld(info->control.vif) &&
if (vif && ieee80211_vif_is_mld(vif) &&
(multicast || unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))))
txwi[5] |= cpu_to_le32(MT_TXD5_FL);
if (ieee80211_is_nullfunc(fc) && ieee80211_has_a4(fc) &&
ieee80211_vif_is_mld(info->control.vif)) {
vif && ieee80211_vif_is_mld(vif)) {
txwi[5] |= cpu_to_le32(MT_TXD5_FL);
txwi[6] |= cpu_to_le32(MT_TXD6_DIS_MAT);
}