linux-kernel - [PATCH 3/3] media: atmel: atmel-isc: fix asd memory allocation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1555064098-19310-4-git-send-email-eugen.hristev@microchip.com>
Date:   Fri, 12 Apr 2019 10:19:49 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <linux-media@...r.kernel.org>, <hverkuil@...all.nl>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <Nicolas.Ferre@...rochip.com>, <mchehab@...nel.org>,
        <ksloat@...pglobal.com>, <Eugen.Hristev@...rochip.com>
Subject: [PATCH 3/3] 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 aef90db..8e072a9 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -2168,8 +2168,11 @@ 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;
@@ -2313,6 +2316,7 @@ 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