Commit c3843694 authored by Yang Yingliang's avatar Yang Yingliang Committed by Tong Tiangen
Browse files

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

stable inclusion
from stable-v4.19.247
commit 6ecd4d5c28408df36a1a6f0b1973f633c949ac1f
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBP72U
CVE: CVE-2022-49375

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6ecd4d5c28408df36a1a6f0b1973f633c949ac1f



--------------------------------

[ Upstream commit d3b43eb5 ]

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Fixes: fc297911 ("rtc: mediatek: Add MT6397 RTC driver")
Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: default avatarAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220505125043.1594771-1-yangyingliang@huawei.com


Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
Signed-off-by: default avatarTong Tiangen <tongtiangen@huawei.com>
parent c14e2b91

drivers/rtc/rtc-mt6397.c

+2 −0
Original line number Diff line number Diff line
@@ -320,6 +320,8 @@ 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->irq = platform_get_irq(pdev, 0);