From: Yang Yingliang <yangyingliang@huawei.com> 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=... -------------------------------- [ 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> Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> --- 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 e9a25ec4d434..cdb1458669d6 100644 --- a/drivers/rtc/rtc-mt6397.c +++ b/drivers/rtc/rtc-mt6397.c @@ -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); -- 2.25.1