From: Andi Shyti <andi@etezian.org>
Date: Sun, 2 Dec 2018 18:30:31 +0000 (+0200)
Subject: iio: core: check 'info' value before registering the device
X-Git-Tag: for-linus-20190104~50^2~78^2~9
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=d45ebf1f986db608e0c7d69e8792ee85c9b7f3f4;p=linux-block.git

iio: core: check 'info' value before registering the device

When the 'info' structure inside indio_dev is left uninitialized,
a segmentation fault occurs.

Check the 'info' value before using it and if it is equal to
NULL, return with -EINVAL.

Signed-off-by: Andi Shyti <andi@etezian.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index a062cfddc5af..4f5cd9f60870 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1671,6 +1671,9 @@ int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
 	if (ret < 0)
 		return ret;
 
+	if (!indio_dev->info)
+		return -EINVAL;
+
 	/* configure elements for the chrdev */
 	indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);