From 332e0d13d3c7d1e4394a513585a3d3b15a0030b8 Mon Sep 17 00:00:00 2001 From: Pan Bian Date: Sun, 23 Apr 2017 20:48:07 +0800 Subject: [PATCH] rtc: gemini: add return value validation Function devm_ioremap() will return a NULL pointer if it fails to remap IO address, and its return value should be validated before it is used. However, in function gemini_rtc_probe(), its return value is not checked. This may result in bad memory access bugs on future access, e.g. calling the function gemini_rtc_read_time(). Signed-off-by: Pan Bian Acked-by: Hans Ulli Kroll Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-gemini.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/rtc/rtc-gemini.c b/drivers/rtc/rtc-gemini.c index ccf0dba..5279390 100644 --- a/drivers/rtc/rtc-gemini.c +++ b/drivers/rtc/rtc-gemini.c @@ -139,6 +139,8 @@ static int gemini_rtc_probe(struct platform_device *pdev) rtc->rtc_base = devm_ioremap(dev, res->start, resource_size(res)); + if (!rtc->rtc_base) + return -ENOMEM; ret = devm_request_irq(dev, rtc->rtc_irq, gemini_rtc_interrupt, IRQF_SHARED, pdev->name, dev); -- 2.7.4