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From: Yang Yingliang <yangyingliang@huawei.com>
To: <sudipm.mukherjee@gmail.com>, <gregkh@linuxfoundation.org>
Cc: <linux-kernel@vger.kernel.org>, <stable@vger.kernel.org>,
	<davem@davemloft.net>, <sashal@kernel.org>
Subject: [PATCH 5.4] net: moxa: Use devm_platform_get_and_ioremap_resource()
Date: Fri, 16 Jul 2021 17:32:45 +0800	[thread overview]
Message-ID: <20210716093245.315536-1-yangyingliang@huawei.com> (raw)

[ Upstream commit 35cba15a504bf4f585bb9d78f47b22b28a1a06b2 ]

Use devm_platform_get_and_ioremap_resource() to simplify
code and avoid a null-ptr-deref by checking 'res' in it.

[yyl: since devm_platform_get_and_ioremap_resource() is introduced
      in linux-5.7, so just check the return value after calling
      platform_get_resource()]

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/moxa/moxart_ether.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/moxa/moxart_ether.c b/drivers/net/ethernet/moxa/moxart_ether.c
index f70bb81e1ed65..caf7051302725 100644
--- a/drivers/net/ethernet/moxa/moxart_ether.c
+++ b/drivers/net/ethernet/moxa/moxart_ether.c
@@ -481,6 +481,10 @@ static int moxart_mac_probe(struct platform_device *pdev)
 	priv->pdev = pdev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		ret = -EINVAL;
+		goto init_fail;
+	}
 	ndev->base_addr = res->start;
 	priv->base = devm_ioremap_resource(p_dev, res);
 	if (IS_ERR(priv->base)) {
-- 
2.25.1


             reply	other threads:[~2021-07-16  9:30 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-16  9:32 Yang Yingliang [this message]
2021-07-19 12:40 ` [PATCH 5.4] net: moxa: Use devm_platform_get_and_ioremap_resource() Greg KH

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