[PATCH 5.8 249/464] media: s5p-g2d: Fix a memory leak in an error handling path in g2d_probe()

[Greg Kroah-Hartman]

From: Christophe JAILLET <christophe.jail...@wanadoo.fr>

[ Upstream commit 94b9ce6870f9c90ac92505482689818b254312f7 ]

Memory allocated with 'v4l2_m2m_init()' must be freed by a corresponding
call to 'v4l2_m2m_release()'

Also reorder the code at the end of the probe function so that
'video_register_device()' is called last.
Update the error handling path accordingly.

Fixes: 5ce60d790a24 ("[media] s5p-g2d: Add DT based discovery support")
Fixes: 918847341af0 ("[media] v4l: add G2D driver for s5p device family")
Signed-off-by: Christophe JAILLET <christophe.jail...@wanadoo.fr>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
[hverkuil-ci...@xs4all.nl: checkpatch: align with parenthesis]
Signed-off-by: Mauro Carvalho Chehab <mchehab+hua...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/media/platform/s5p-g2d/g2d.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/media/platform/s5p-g2d/g2d.c 
b/drivers/media/platform/s5p-g2d/g2d.c
index 6932fd47071b0..15bcb7f6e113c 100644
--- a/drivers/media/platform/s5p-g2d/g2d.c
+++ b/drivers/media/platform/s5p-g2d/g2d.c
@@ -695,21 +695,13 @@ static int g2d_probe(struct platform_device *pdev)
        vfd->lock = &dev->mutex;
        vfd->v4l2_dev = &dev->v4l2_dev;
        vfd->device_caps = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
-       ret = video_register_device(vfd, VFL_TYPE_VIDEO, 0);
-       if (ret) {
-               v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
-               goto rel_vdev;
-       }
-       video_set_drvdata(vfd, dev);
-       dev->vfd = vfd;
-       v4l2_info(&dev->v4l2_dev, "device registered as /dev/video%d\n",
-                                                               vfd->num);
+
        platform_set_drvdata(pdev, dev);
        dev->m2m_dev = v4l2_m2m_init(&g2d_m2m_ops);
        if (IS_ERR(dev->m2m_dev)) {
                v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
                ret = PTR_ERR(dev->m2m_dev);
-               goto unreg_video_dev;
+               goto rel_vdev;
        }
 
        def_frame.stride = (def_frame.width * def_frame.fmt->depth) >> 3;
@@ -717,14 +709,24 @@ static int g2d_probe(struct platform_device *pdev)
        of_id = of_match_node(exynos_g2d_match, pdev->dev.of_node);
        if (!of_id) {
                ret = -ENODEV;
-               goto unreg_video_dev;
+               goto free_m2m;
        }
        dev->variant = (struct g2d_variant *)of_id->data;
 
+       ret = video_register_device(vfd, VFL_TYPE_VIDEO, 0);
+       if (ret) {
+               v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
+               goto free_m2m;
+       }
+       video_set_drvdata(vfd, dev);
+       dev->vfd = vfd;
+       v4l2_info(&dev->v4l2_dev, "device registered as /dev/video%d\n",
+                 vfd->num);
+
        return 0;
 
-unreg_video_dev:
-       video_unregister_device(dev->vfd);
+free_m2m:
+       v4l2_m2m_release(dev->m2m_dev);
 rel_vdev:
        video_device_release(vfd);
 unreg_v4l2_dev:
-- 
2.25.1