linux-kernel - [PATCH] hwmon: (dme1737): Add missing null check on return from platform_get

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Message-Id: <20210406185458.433826-1-colin.king@canonical.com>
Date:   Tue,  6 Apr 2021 19:54:58 +0100
From:   Colin King <colin.king@...onical.com>
To:     Juerg Haefliger <juergh@...il.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        "Mark M . Hoffman" <mhoffman@...htlink.com>,
        linux-hwmon@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH]  hwmon: (dme1737): Add missing null check on return from platform_get_resource

From: Colin Ian King <colin.king@...onical.com>

The call to platform_get_resource can potentially return a NULL pointer
on failure, so add this check and return -EINVAL if it fails.

Addresses-Coverity: ("Dereference null return")
Fixes: e95c237d78c0 ("hwmon: (dme1737) Add sch311x support")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/hwmon/dme1737.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwmon/dme1737.c b/drivers/hwmon/dme1737.c
index c1e4cfb40c3d..a2157872e126 100644
--- a/drivers/hwmon/dme1737.c
+++ b/drivers/hwmon/dme1737.c
@@ -2633,6 +2633,8 @@ static int dme1737_isa_probe(struct platform_device *pdev)
 	int err;
 
 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res)
+		return -EINVAL;
 	if (!devm_request_region(dev, res->start, DME1737_EXTENT, "dme1737")) {
 		dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
 			(unsigned short)res->start,
-- 
2.30.2