From: Yang Yingliang <yangyingliang@huawei.com>
Date: Thu, 5 May 2022 12:50:43 +0000 (+0800)
Subject: rtc: mt6397: check return value after calling platform_get_resource()
X-Git-Tag: v5.10.122~144
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=82bfea344e8f7e9a0e0b1bf9af27552baa756620;p=thirdparty%2Fkernel%2Fstable.git

rtc: mt6397: check return value after calling platform_get_resource()

[ Upstream commit d3b43eb505bffb8e4cdf6800c15660c001553fe6 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
index 1894aded4c857..acfcb378767db 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);