linux-kernel - [PATCH 1/1] power: Fix unchecked return value of devm

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Date:   Mon, 24 Apr 2017 16:22:08 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Pali Rohár <pali.rohar@...il.com>,
        Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Pan Bian <bianpan2016@....com>
Subject: [PATCH 1/1] power: Fix unchecked return value of devm_kzalloc

Function devm_kzalloc() will return a NULL pointer. However, in function
isp1704_charger_probe(), the return value of devm_kzalloc() is directly
used without validation. This may result in a bad memory access bug.

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/power/supply/isp1704_charger.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/power/supply/isp1704_charger.c b/drivers/power/supply/isp1704_charger.c
index 4cd6899..95af5f3 100644
--- a/drivers/power/supply/isp1704_charger.c
+++ b/drivers/power/supply/isp1704_charger.c
@@ -418,6 +418,10 @@ static int isp1704_charger_probe(struct platform_device *pdev)
 
 		pdata = devm_kzalloc(&pdev->dev,
 			sizeof(struct isp1704_charger_data), GFP_KERNEL);
+		if (!pdata) {
+			ret = -ENOMEM;
+			goto fail0;
+		}
 		pdata->enable_gpio = gpio;
 
 		dev_info(&pdev->dev, "init gpio %d\n", pdata->enable_gpio);
-- 
1.9.1