linux-kernel - [PATCH net] arcnet: fix potential memory leak in com20020

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Message-ID: <20221120062438.46090-1-wanghai38@huawei.com>
Date:   Sun, 20 Nov 2022 14:24:38 +0800
From:   Wang Hai <wanghai38@...wei.com>
To:     <m.grzeschik@...gutronix.de>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux@...inikbrodowski.net>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH net] arcnet: fix potential memory leak in com20020_probe()

In com20020_probe(), if com20020_config() fails, dev and info
will not be freed, which will lead to a memory leak.

This patch adds freeing dev and info after com20020_config()
fails to fix this bug.

Compile tested only.

Fixes: 15b99ac17295 ("[PATCH] pcmcia: add return value to _config() functions")
Signed-off-by: Wang Hai <wanghai38@...wei.com>
---
 drivers/net/arcnet/com20020_cs.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/arcnet/com20020_cs.c b/drivers/net/arcnet/com20020_cs.c
index 24150c933fcb..dc3253b318da 100644
--- a/drivers/net/arcnet/com20020_cs.c
+++ b/drivers/net/arcnet/com20020_cs.c
@@ -113,6 +113,7 @@ static int com20020_probe(struct pcmcia_device *p_dev)
 	struct com20020_dev *info;
 	struct net_device *dev;
 	struct arcnet_local *lp;
+	int ret = -ENOMEM;
 
 	dev_dbg(&p_dev->dev, "com20020_attach()\n");
 
@@ -142,12 +143,18 @@ static int com20020_probe(struct pcmcia_device *p_dev)
 	info->dev = dev;
 	p_dev->priv = info;
 
-	return com20020_config(p_dev);
+	ret = com20020_config(p_dev);
+	if (ret)
+		goto fail_config;
+
+	return 0;
 
+fail_config:
+	free_arcdev(dev);
 fail_alloc_dev:
 	kfree(info);
 fail_alloc_info:
-	return -ENOMEM;
+	return ret;
 } /* com20020_attach */
 
 static void com20020_detach(struct pcmcia_device *link)
-- 
2.17.1