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Date: Mon, 24 Jan 2022 19:35:01 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Lorenzo Bianconi <lorenzo@...nel.org>, Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.16 0312/1039] mt76: mt7921: fix possible NULL pointer dereference in mt7921_mac_write_txwi From: Lorenzo Bianconi <lorenzo@...nel.org> [ Upstream commit ec2ebc1c5a5ce49538fa78108c53eaf722eee908 ] Fix a possible NULL pointer deference issue in mt7921_mac_write_txwi routine if vif is NULL. Fixes: 33920b2bf0483 ("mt76: add support for setting mcast rate") Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org> Signed-off-by: Felix Fietkau <nbd@....name> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/net/wireless/mediatek/mt76/mt7921/mac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c index db3302b1576a0..321d9f1d3f865 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c @@ -903,7 +903,7 @@ void mt7921_mac_write_txwi(struct mt7921_dev *dev, __le32 *txwi, mt7921_mac_write_txwi_80211(dev, txwi, skb, key); if (txwi[2] & cpu_to_le32(MT_TXD2_FIX_RATE)) { - int rateidx = ffs(vif->bss_conf.basic_rates) - 1; + int rateidx = vif ? ffs(vif->bss_conf.basic_rates) - 1 : 0; u16 rate, mode; /* hardware won't add HTC for mgmt/ctrl frame */ -- 2.34.1
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