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wifi: mt76: mt7996: fix possible NULL pointer dereference in mt7996_mac_write_txwi() 

Fix possible NULL pointer dereference on mvif pointer in
mt7996_mac_write_txwi routine.

Fixes: 15ee62e737 ("wifi: mt76: mt7996: enable BSS_CHANGED_BASIC_RATES support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/2637628a84f42ad6d7b774e706f041d5b45c8cb5.1685269638.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi 2023-05-28 12:28:49 +02:00 committed by Kalle Valo
parent b408f33b35
commit ead449023d
1 changed files with 12 additions and 7 deletions
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19
drivers/net/wireless/mediatek/mt76/mt7996/mac.c
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@ -1004,10 +1004,10 @@ void mt7996_mac_write_txwi(struct mt7996_dev *dev, __le32 *txwi,
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_vif *vif = info->control.vif;
struct mt7996_vif *mvif = (struct mt7996_vif *)vif->drv_priv;
u8 band_idx = (info->hw_queue & MT_TX_HW_QUEUE_PHY) >> 2;
u8 p_fmt, q_idx, omac_idx = 0, wmm_idx = 0;
bool is_8023 = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
struct mt7996_vif *mvif;
u16 tx_count = 15;
u32 val;
bool beacon = !!(changed & (BSS_CHANGED_BEACON |
@ -1015,7 +1015,8 @@ void mt7996_mac_write_txwi(struct mt7996_dev *dev, __le32 *txwi,
bool inband_disc = !!(changed & (BSS_CHANGED_UNSOL_BCAST_PROBE_RESP |
BSS_CHANGED_FILS_DISCOVERY));
if (vif) {
mvif = vif ? (struct mt7996_vif *)vif->drv_priv : NULL;
if (mvif) {
omac_idx = mvif->mt76.omac_idx;
wmm_idx = mvif->mt76.wmm_idx;
band_idx = mvif->mt76.band_idx;
@ -1081,12 +1082,16 @@ void mt7996_mac_write_txwi(struct mt7996_dev *dev, __le32 *txwi,
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
bool mcast = ieee80211_is_data(hdr->frame_control) &&
is_multicast_ether_addr(hdr->addr1);
u8 idx = mvif->basic_rates_idx;
u8 idx = MT7996_BASIC_RATES_TBL;
if (mcast && mvif->mcast_rates_idx)
idx = mvif->mcast_rates_idx;
else if (beacon && mvif->beacon_rates_idx)
idx = mvif->beacon_rates_idx;
if (mvif) {
if (mcast && mvif->mcast_rates_idx)
idx = mvif->mcast_rates_idx;
else if (beacon && mvif->beacon_rates_idx)
idx = mvif->beacon_rates_idx;
else
idx = mvif->basic_rates_idx;
}
txwi[6] |= cpu_to_le32(FIELD_PREP(MT_TXD6_TX_RATE, idx));
txwi[3] |= cpu_to_le32(MT_TXD3_BA_DISABLE);