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

* [PATCH] clk: sunxi: sun9i-mmc: check return value after calling platform_get_resource()
@ 2022-04-21 13:43 Yang Yingliang
  2022-04-23 19:45 ` Samuel Holland
  0 siblings, 1 reply; 3+ messages in thread
From: Yang Yingliang @ 2022-04-21 13:43 UTC (permalink / raw)
  To: linux-kernel, linux-sunxi, linux-arm-kernel, linux-clk; +Cc: wens, maxime

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>
---
 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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