From 071c8ce8e92a86b8bf78678e78eb4b79fdc16768 Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Mon, 14 Sep 2020 20:29:01 +0200
Subject: [PATCH] mt76: mt7915: fix possible memory leak in mt7915_mcu_add_beacon
Git-commit: 071c8ce8e92a86b8bf78678e78eb4b79fdc16768
Patch-mainline: v5.10-rc1
References: git-fixes

Release mcu message memory in case of failure in mt7915_mcu_add_beacon
routine

Fixes: e57b7901469fc ("mt76: add mac80211 driver for MT7915 PCIe-based chipsets")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index d43de4334617..c1b3b7a6548a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -2428,14 +2428,6 @@ int mt7915_mcu_add_beacon(struct ieee80211_hw *hw,
 	struct bss_info_bcn *bcn;
 	int len = MT7915_BEACON_UPDATE_SIZE + MAX_BEACON_SIZE;
 
-	rskb = mt7915_mcu_alloc_sta_req(dev, mvif, NULL, len);
-	if (IS_ERR(rskb))
-		return PTR_ERR(rskb);
-
-	tlv = mt7915_mcu_add_tlv(rskb, BSS_INFO_OFFLOAD, sizeof(*bcn));
-	bcn = (struct bss_info_bcn *)tlv;
-	bcn->enable = en;
-
 	skb = ieee80211_beacon_get_template(hw, vif, &offs);
 	if (!skb)
 		return -EINVAL;
@@ -2446,6 +2438,16 @@ int mt7915_mcu_add_beacon(struct ieee80211_hw *hw,
 		return -EINVAL;
 	}
 
+	rskb = mt7915_mcu_alloc_sta_req(dev, mvif, NULL, len);
+	if (IS_ERR(rskb)) {
+		dev_kfree_skb(skb);
+		return PTR_ERR(rskb);
+	}
+
+	tlv = mt7915_mcu_add_tlv(rskb, BSS_INFO_OFFLOAD, sizeof(*bcn));
+	bcn = (struct bss_info_bcn *)tlv;
+	bcn->enable = en;
+
 	if (mvif->band_idx) {
 		info = IEEE80211_SKB_CB(skb);
 		info->hw_queue |= MT_TX_HW_QUEUE_EXT_PHY;
-- 
2.16.4