From 4acd5adecf20bf9af4ae85de10150c13eb3aca65 Mon Sep 17 00:00:00 2001 From: Michael Straube Date: Sun, 25 Nov 2018 10:22:25 +0100 Subject: [PATCH] staging: pi433: fix potential null dereference [ Upstream commit 64c4c4ca6c129a4191e8e1e91b2d5d9b8d08c518 ] Add a test for successful call to cdev_alloc() to avoid potential null dereference. Issue reported by smatch. Signed-off-by: Michael Straube Fixes: 874bcba65f9a ("staging: pi433: New driver") Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- 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 c85a805a1243..a497ec197872 100644 --- a/drivers/staging/pi433/pi433_if.c +++ b/drivers/staging/pi433/pi433_if.c @@ -1255,6 +1255,10 @@ 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);