linux-kernel - [PATCH AUTOSEL 5.2 094/249] media: davinci: vpif_capture: fix memory leak in vpif

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Date:   Mon, 15 Jul 2019 09:44:19 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Young Xiao <92siuyang@...il.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 5.2 094/249] media: davinci: vpif_capture: fix memory leak in vpif_probe()

From: Young Xiao <92siuyang@...il.com>

[ Upstream commit 64f883cd98c6d43013fb0cea788b63e50ebc068c ]

If vpif_probe() fails on v4l2_device_register() and vpif_probe_complete(),
then memory allocated at initialize_vpif() for global vpif_obj.dev[i]
become unreleased.

The patch adds deallocation of vpif_obj.dev[i] on the error path.

Signed-off-by: Young Xiao <92siuyang@...il.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/davinci/vpif_capture.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index 61809d2050fa..f0f7ef638c56 100644
--- a/drivers/media/platform/davinci/vpif_capture.c
+++ b/drivers/media/platform/davinci/vpif_capture.c
@@ -1376,6 +1376,14 @@ static int initialize_vpif(void)
 	return err;
 }
 
+static inline void free_vpif_objs(void)
+{
+	int i;
+
+	for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++)
+		kfree(vpif_obj.dev[i]);
+}
+
 static int vpif_async_bound(struct v4l2_async_notifier *notifier,
 			    struct v4l2_subdev *subdev,
 			    struct v4l2_async_subdev *asd)
@@ -1645,7 +1653,7 @@ static __init int vpif_probe(struct platform_device *pdev)
 	err = v4l2_device_register(vpif_dev, &vpif_obj.v4l2_dev);
 	if (err) {
 		v4l2_err(vpif_dev->driver, "Error registering v4l2 device\n");
-		goto cleanup;
+		goto vpif_free;
 	}
 
 	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) {
@@ -1692,7 +1700,9 @@ static __init int vpif_probe(struct platform_device *pdev)
 				  "registered sub device %s\n",
 				   subdevdata->name);
 		}
-		vpif_probe_complete();
+		err = vpif_probe_complete();
+		if (err)
+			goto probe_subdev_out;
 	} else {
 		vpif_obj.notifier.ops = &vpif_async_ops;
 		err = v4l2_async_notifier_register(&vpif_obj.v4l2_dev,
@@ -1711,6 +1721,8 @@ static __init int vpif_probe(struct platform_device *pdev)
 	kfree(vpif_obj.sd);
 vpif_unregister:
 	v4l2_device_unregister(&vpif_obj.v4l2_dev);
+vpif_free:
+	free_vpif_objs();
 cleanup:
 	v4l2_async_notifier_cleanup(&vpif_obj.notifier);
 
-- 
2.20.1