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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Lorenzo Bianconi <lorenzo@kernel.org>,
        Felix Fietkau <nbd@nbd.name>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.9 318/757] mt76: mt7615: fix possible memory leak in mt7615_tm_set_tx_power
Date:   Tue, 27 Oct 2020 14:49:28 +0100
Message-Id: <20201027135505.455364635@linuxfoundation.org>
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From: Lorenzo Bianconi <lorenzo@kernel.org>

[ Upstream commit e862825dcf74203c5ab60335c341766808f47507 ]

Fix a memory leak in mt7615_tm_set_tx_power routine if
mt7615_eeprom_get_target_power_index fails.
Moreover do not account req_header twice in mcu skb allocation.

Fixes: 4f0bce1c88882 ("mt76: mt7615: implement testmode support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7615/testmode.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/testmode.c b/drivers/net/wireless/mediatek/mt76/mt7615/testmode.c
index 1730751133aa2..2cfa58d49832f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/testmode.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/testmode.c
@@ -70,7 +70,7 @@ mt7615_tm_set_tx_power(struct mt7615_phy *phy)
 	if (dev->mt76.test.state != MT76_TM_STATE_OFF)
 		tx_power = dev->mt76.test.tx_power;
 
-	len = sizeof(req_hdr) + MT7615_EE_MAX - MT_EE_NIC_CONF_0;
+	len = MT7615_EE_MAX - MT_EE_NIC_CONF_0;
 	skb = mt76_mcu_msg_alloc(&dev->mt76, NULL, sizeof(req_hdr) + len);
 	if (!skb)
 		return -ENOMEM;
@@ -83,8 +83,10 @@ mt7615_tm_set_tx_power(struct mt7615_phy *phy)
 		int index;
 
 		ret = mt7615_eeprom_get_target_power_index(dev, chandef->chan, i);
-		if (ret < 0)
+		if (ret < 0) {
+			dev_kfree_skb(skb);
 			return -EINVAL;
+		}
 
 		index = ret - MT_EE_NIC_CONF_0;
 		if (tx_power && tx_power[i])
-- 
2.25.1