linux-kernel - [PATCH] clk: sunxi: sun9i-mmc: check return value after calling platform_get

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Message-ID: <20220421134308.2885094-1-yangyingliang@huawei.com>
Date:   Thu, 21 Apr 2022 21:43:08 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-sunxi@...ts.linux.dev>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-clk@...r.kernel.org>
CC:     <wens@...e.org>, <maxime@...no.tech>
Subject: [PATCH] clk: sunxi: sun9i-mmc: check return value after calling platform_get_resource()

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

Fixes: 7a6fca879f59 ("clk: sunxi: Add driver for A80 MMC config clocks/resets")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.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