linux-kernel - [PATCH 5.4] net: moxa: Use devm_platform_get_and_ioremap

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Date:   Fri, 16 Jul 2021 17:32:45 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <sudipm.mukherjee@...il.com>, <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
        <davem@...emloft.net>, <sashal@...nel.org>
Subject: [PATCH 5.4] net: moxa: Use devm_platform_get_and_ioremap_resource()

[ 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@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.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