linux-kernel - [PATCH] staging: pi433: fix potential null dereference

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Message-Id: <20181125092225.10188-1-straube.linux@gmail.com>
Date:   Sun, 25 Nov 2018 10:22:25 +0100
From:   Michael Straube <straube.linux@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     linux@...f-entwicklungen.de, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org,
        Michael Straube <straube.linux@...il.com>
Subject: [PATCH] staging: pi433: fix potential null dereference

Add a test for successful call to cdev_alloc() to avoid
potential null dereference. Issue reported by smatch.

Signed-off-by: Michael Straube <straube.linux@...il.com>
---
 drivers/staging/pi433/pi433_if.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/pi433/pi433_if.c b/drivers/staging/pi433/pi433_if.c
index 786478671190..d72de2105053 100644
--- a/drivers/staging/pi433/pi433_if.c
+++ b/drivers/staging/pi433/pi433_if.c
@@ -1245,6 +1245,10 @@ static int pi433_probe(struct spi_device *spi)
 
 	/* create cdev */
 	device->cdev = cdev_alloc();
+	if (!device->cdev) {
+		dev_dbg(device->dev, "allocation of cdev failed");
+		goto cdev_failed;
+	}
 	device->cdev->owner = THIS_MODULE;
 	cdev_init(device->cdev, &pi433_fops);
 	retval = cdev_add(device->cdev, device->devt, 1);
-- 
2.19.2