From f58ca215cda1975f77b2b762903684a3c101bec9 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Thu, 21 Apr 2022 21:43:08 +0800
Subject: [PATCH] clk: sunxi: sun9i-mmc: check return value after calling platform_get_resource()
Git-commit: f58ca215cda1975f77b2b762903684a3c101bec9
Patch-mainline: v5.18-rc5
References: git-fixes

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@huawei.com>
Reviewed-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220421134308.2885094-1-yangyingliang@huawei.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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);
-- 
2.31.1