[PATCH 3.16.y-ckt 065/129] iio: inkern: fix a NULL dereference on error

From: Luis Henriques
Date: Fri Feb 26 2016 - 05:51:23 EST

3.16.7-ckt25 -stable review patch. If anyone has any objections, please let me know.


From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
drivers/iio/inkern.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index f0846108d006..3978c0d89ae1 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -325,6 +325,8 @@ EXPORT_SYMBOL_GPL(iio_channel_get);

void iio_channel_release(struct iio_channel *channel)
+ if (!channel)
+ return;