linux-kernel - [PATCH 1/1] rtc: gemini: add return value validation

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Date:   Sun, 23 Apr 2017 20:48:07 +0800
From:   Pan Bian <bianpan201602@....com>
To:     Hans Ulli Kroll <ulli.kroll@...glemail.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        rtc-linux@...glegroups.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: [PATCH 1/1] rtc: gemini: add return value validation

From: Pan Bian <bianpan2016@....com>

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 <bianpan2016@....com>
---
 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);
-- 
1.9.1