[PATCH] clk: sunxi: sun9i-mmc: check return value after calling platform_get_resource()

From: Yang Yingliang <yangyingliang@huawei.com>
To: <linux-kernel@vger.kernel.org>, <linux-sunxi@lists.linux.dev>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-clk@vger.kernel.org>
Cc: <p.zabel@pengutronix.de>, <mturquette@baylibre.com>
Subject: [PATCH] clk: sunxi: sun9i-mmc: check return value after calling platform_get_resource()
Date: Sat, 18 Sep 2021 15:37:52 +0800	[thread overview]
Message-ID: <20210918073752.105959-1-yangyingliang@huawei.com> (raw)

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/clk/sunxi/clk-sun9i-mmc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/sunxi/clk-sun9i-mmc.c b/drivers/clk/sunxi/clk-sun9i-mmc.c
index 542b31d6e96d..636bcf2439ef 100644
--- a/drivers/clk/sunxi/clk-sun9i-mmc.c
+++ b/drivers/clk/sunxi/clk-sun9i-mmc.c
@@ -109,6 +109,8 @@ static int sun9i_a80_mmc_config_clk_probe(struct platform_device *pdev)
 	spin_lock_init(&data->lock);
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r)
+		return -EINVAL;
 	/* one clock/reset pair per word */
 	count = DIV_ROUND_UP((resource_size(r)), SUN9I_MMC_WIDTH);
 	data->membase = devm_ioremap_resource(&pdev->dev, r);
-- 
2.25.1


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