linux-kernel - [PATCH 7/7] media: atmel: atmel-isc: fix asd memory allocation

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Date:   Tue, 9 Apr 2019 11:07:36 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <linux-media@...r.kernel.org>, <hverkuil@...all.nl>,
        <Nicolas.Ferre@...rochip.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <mchehab@...nel.org>
CC:     <ksloat@...pglobal.com>, <Eugen.Hristev@...rochip.com>
Subject: [PATCH 7/7] media: atmel: atmel-isc: fix asd memory allocation

From: Eugen Hristev <eugen.hristev@...rochip.com>

The subsystem will free the asd memory on notifier cleanup, if the asd is
added to the notifier.
However the memory is freed using kfree.
Thus, we cannot allocate the asd using devm_*
This can lead to crashes and problems.
To test this issue, just return an error at probe, but cleanup the
notifier beforehand.

Fixes: 106267444f ("[media] atmel-isc: add the Image Sensor Controller code")
Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
---
 drivers/media/platform/atmel/atmel-isc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/atmel/atmel-isc.c b/drivers/media/platform/atmel/atmel-isc.c
index 48652c0..8d8cce5 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -2408,8 +2408,11 @@ static int isc_parse_dt(struct device *dev, struct isc_device *isc)
 			break;
 		}
 
-		subdev_entity->asd = devm_kzalloc(dev,
-				     sizeof(*subdev_entity->asd), GFP_KERNEL);
+		/* asd will be freed by the subsystem once it's added to the
+		 * notifier list
+		 */
+		subdev_entity->asd = kzalloc(sizeof(*subdev_entity->asd),
+					     GFP_KERNEL);
 		if (!subdev_entity->asd) {
 			of_node_put(rem);
 			ret = -ENOMEM;
@@ -2553,6 +2556,7 @@ static int atmel_isc_probe(struct platform_device *pdev)
 						     subdev_entity->asd);
 		if (ret) {
 			fwnode_handle_put(subdev_entity->asd->match.fwnode);
+			kfree(subdev_entity->asd);
 			goto cleanup_subdev;
 		}
 
-- 
2.7.4