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@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

diff --git a/drivers/clk/sunxi/clk-sun9i-mmc.c b/drivers/clk/sunxi/clk-sun9i-mmc.c
index 542b31d6e96dddaa5907a9602d4193231f648f0c..636bcf2439ef264c2164977c6c9655d7d069c957 100644 (file)
--- 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);