From d3b43eb505bffb8e4cdf6800c15660c001553fe6 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Thu, 5 May 2022 20:50:43 +0800
Subject: [PATCH] rtc: mt6397: check return value after calling platform_get_resource()
Git-commit: d3b43eb505bffb8e4cdf6800c15660c001553fe6
Patch-mainline: v5.19-rc1
References: git-fixes
It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.
Fixes: fc2979118f3f ("rtc: mediatek: Add MT6397 RTC driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220505125043.1594771-1-yangyingliang@huawei.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/rtc/rtc-mt6397.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
index 80dc479a6ff0..1d297af80f87 100644
--- a/drivers/rtc/rtc-mt6397.c
+++ b/drivers/rtc/rtc-mt6397.c
@@ -269,6 +269,8 @@ static int mtk_rtc_probe(struct platform_device *pdev)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
rtc->addr_base = res->start;
rtc->data = of_device_get_match_data(&pdev->dev);
--
2.35.3