[X][CVE-2019-19060][SRU][PATCH 1/1] iio: imu: adis16400: release allocated memory on failure

[Po-Hsu Lin]

From: Navid Emamdoost <navid.emamdoost at gmail.com>

CVE-2019-19060

In adis_update_scan_mode, if allocation for adis->buffer fails,
previously allocated adis->xfer needs to be released.

Signed-off-by: Navid Emamdoost <navid.emamdoost at gmail.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean at analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron at huawei.com>
(backported from commit ab612b1daf415b62c58e130cb3d0f30b255a14d0)
[PHLin: context adjustment]
Signed-off-by: Po-Hsu Lin <po-hsu.lin at canonical.com>
---
 drivers/iio/imu/adis_buffer.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/imu/adis_buffer.c b/drivers/iio/imu/adis_buffer.c
index 36607d5..9de553e 100644
--- a/drivers/iio/imu/adis_buffer.c
+++ b/drivers/iio/imu/adis_buffer.c
@@ -39,8 +39,11 @@ int adis_update_scan_mode(struct iio_dev *indio_dev,
 		return -ENOMEM;
 
 	adis->buffer = kzalloc(indio_dev->scan_bytes * 2, GFP_KERNEL);
-	if (!adis->buffer)
+	if (!adis->buffer) {
+		kfree(adis->xfer);
+		adis->xfer = NULL;
 		return -ENOMEM;
+	}
 
 	rx = adis->buffer;
 	tx = rx + scan_count;
-- 
2.7.4