linux-kernel - [PATCH 3.16 096/134] power: supply: isp1704: Fix unchecked return value of devm

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Date:   Fri, 18 Aug 2017 14:13:20 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Pan Bian" <bianpan2016@....com>,
        "Sebastian Reichel" <sebastian.reichel@...labora.co.uk>,
        "Pali Rohár" <pali.rohar@...il.com>
Subject: [PATCH 3.16 096/134] power: supply: isp1704: Fix unchecked return
 value of devm_kzalloc

3.16.47-rc1 review patch.  If anyone has any objections, please let me know.

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

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

commit 8b20839988f1ed5e534b270f3776709b640dc7e0 upstream.

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.

Fixes: 34a109610e2a ("isp1704_charger: Add DT support")
Signed-off-by: Pan Bian <bianpan2016@....com>
Reviewed-by: Pali Rohár <pali.rohar@...il.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/power/isp1704_charger.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/power/isp1704_charger.c
+++ b/drivers/power/isp1704_charger.c
@@ -415,6 +415,10 @@ static int isp1704_charger_probe(struct
 
 		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);