linux-kernel - [PATCH 4.19 195/321] net/wan/fsl_ucc_hdlc: Avoid double free in ucc_hdlc

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Date:   Tue,  3 Dec 2019 23:34:21 +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, Wen Yang <wen.yang99@....com.cn>,
        Peng Hao <peng.hao2@....com.cn>,
        Zhao Qiang <qiang.zhao@....com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 195/321] net/wan/fsl_ucc_hdlc: Avoid double free in ucc_hdlc_probe()

From: Wen Yang <wen.yang99@....com.cn>

[ Upstream commit 40752b3eae29f8ca2378e978a02bd6dbeeb06d16 ]

This patch fixes potential double frees if register_hdlc_device() fails.

Signed-off-by: Wen Yang <wen.yang99@....com.cn>
Reviewed-by: Peng Hao <peng.hao2@....com.cn>
CC: Zhao Qiang <qiang.zhao@....com>
CC: "David S. Miller" <davem@...emloft.net>
CC: netdev@...r.kernel.org
CC: linuxppc-dev@...ts.ozlabs.org
CC: linux-kernel@...r.kernel.org
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wan/fsl_ucc_hdlc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index 5f0366a125e26..0212f576a838c 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -1113,7 +1113,6 @@ static int ucc_hdlc_probe(struct platform_device *pdev)
 	if (register_hdlc_device(dev)) {
 		ret = -ENOBUFS;
 		pr_err("ucc_hdlc: unable to register hdlc device\n");
-		free_netdev(dev);
 		goto free_dev;
 	}
 
-- 
2.20.1