linux-kernel - [PATCH] rtc: mt6397: Check for null res pointer

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Date:   Mon, 20 Dec 2021 16:38:11 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     sean.wang@...iatek.com, sre@...nel.org, matthias.bgg@...il.com
Cc:     linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] rtc: mt6397: Check for null res pointer

The return value of platform_get_resource() needs to be checked.
To avoid use of error pointer in case that there is no suitable
resource.

Fixes: d28c74c10751 ("power: reset: add driver for mt6323 poweroff")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/power/reset/mt6323-poweroff.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/power/reset/mt6323-poweroff.c b/drivers/power/reset/mt6323-poweroff.c
index 0532803e6cbc..d90e76fcb938 100644
--- a/drivers/power/reset/mt6323-poweroff.c
+++ b/drivers/power/reset/mt6323-poweroff.c
@@ -57,6 +57,9 @@ static int mt6323_pwrc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
+
 	pwrc->base = res->start;
 	pwrc->regmap = mt6397_chip->regmap;
 	pwrc->dev = &pdev->dev;
-- 
2.25.1