linux-kernel - [PATCH AUTOSEL 4.18 077/136] staging: mt7621-eth: Fix memory leak in mtk_add

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Message-ID: <20180917030006.245495-77-alexander.levin@microsoft.com>
Date:   Mon, 17 Sep 2018 03:01:00 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Kamal Heib <kamalheib1@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 077/136] staging: mt7621-eth: Fix memory leak in
 mtk_add_mac() error path

From: Kamal Heib <kamalheib1@...il.com>

[ Upstream commit 85e1d42663a0c163002961d2685be952067b0dc2 ]

Fix memory leak in error path of mtk_add_mac() by make sure to free
the allocated netdev.

Fixes: e3cbf478f846 ('staging: mt7621-eth: add the drivers core files')
Signed-off-by: Kamal Heib <kamalheib1@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/staging/mt7621-eth/mtk_eth_soc.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/mt7621-eth/mtk_eth_soc.c b/drivers/staging/mt7621-eth/mtk_eth_soc.c
index 2c7a2e666bfb..381d9d270bf5 100644
--- a/drivers/staging/mt7621-eth/mtk_eth_soc.c
+++ b/drivers/staging/mt7621-eth/mtk_eth_soc.c
@@ -2012,8 +2012,10 @@ static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
 		mac->hw_stats = devm_kzalloc(eth->dev,
 					     sizeof(*mac->hw_stats),
 					     GFP_KERNEL);
-		if (!mac->hw_stats)
-			return -ENOMEM;
+		if (!mac->hw_stats) {
+			err = -ENOMEM;
+			goto free_netdev;
+		}
 		spin_lock_init(&mac->hw_stats->stats_lock);
 		mac->hw_stats->reg_offset = id * MTK_STAT_OFFSET;
 	}
@@ -2037,7 +2039,8 @@ static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
 	err = register_netdev(eth->netdev[id]);
 	if (err) {
 		dev_err(eth->dev, "error bringing up device\n");
-		return err;
+		err = -ENOMEM;
+		goto free_netdev;
 	}
 	eth->netdev[id]->irq = eth->irq;
 	netif_info(eth, probe, eth->netdev[id],
@@ -2045,6 +2048,10 @@ static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
 		   eth->netdev[id]->base_addr, eth->netdev[id]->irq);
 
 	return 0;
+
+free_netdev:
+	free_netdev(eth->netdev[id]);
+	return err;
 }
 
 static int mtk_probe(struct platform_device *pdev)
-- 
2.17.1