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[4.2.y-ckt,049/273] iio: inkern: fix a NULL dereference on error

Message ID 1457391064-6660-50-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa March 7, 2016, 10:47 p.m. UTC 
4.2.8-ckt5 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Dan Carpenter <dan.carpenter@oracle.com>

commit d81dac3c1c5295c61b15293074ac2bd3254e1875 upstream.

In twl4030_bci_probe() there are some failure paths where we call
iio_channel_release() with a NULL pointer.  (Apparently, that driver can
opperate without a valid channel pointer).  Let's fix it by adding a
NULL check in iio_channel_release().

Fixes: 2202e1fc5a29 ('drivers: power: twl4030_charger: fix link problems when building as module')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/iio/inkern.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index c8bad3c..217e930 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -351,6 +351,8 @@  EXPORT_SYMBOL_GPL(iio_channel_get);
 
 void iio_channel_release(struct iio_channel *channel)
 {
+	if (!channel)
+		return;
 	iio_device_put(channel->indio_dev);
 	kfree(channel);
 }