[PATCH 4.18 055/158] media: davinci: vpif_display: Mix memory leak on probe error path

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anton Vasilyev <vasil...@ispras.ru>

[ Upstream commit 61e641f36ed81ae473177c085f0bfd83ad3b55ed ]

If vpif_probe() fails on v4l2_device_register() 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 and
removes duplicated check on platform_data presence.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasil...@ispras.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/media/platform/davinci/vpif_display.c |   24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

--- a/drivers/media/platform/davinci/vpif_display.c
+++ b/drivers/media/platform/davinci/vpif_display.c
@@ -1114,6 +1114,14 @@ vpif_init_free_channel_objects:
        return err;
 }
 
+static void free_vpif_objs(void)
+{
+       int i;
+
+       for (i = 0; i < VPIF_DISPLAY_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)
@@ -1255,11 +1263,6 @@ static __init int vpif_probe(struct plat
                return -EINVAL;
        }
 
-       if (!pdev->dev.platform_data) {
-               dev_warn(&pdev->dev, "Missing platform data.  Giving up.\n");
-               return -EINVAL;
-       }
-
        vpif_dev = &pdev->dev;
        err = initialize_vpif();
 
@@ -1271,7 +1274,7 @@ static __init int vpif_probe(struct plat
        err = v4l2_device_register(vpif_dev, &vpif_obj.v4l2_dev);
        if (err) {
                v4l2_err(vpif_dev->driver, "Error registering v4l2 device\n");
-               return err;
+               goto vpif_free;
        }
 
        while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) {
@@ -1314,7 +1317,10 @@ static __init int vpif_probe(struct plat
                        if (vpif_obj.sd[i])
                                vpif_obj.sd[i]->grp_id = 1 << i;
                }
-               vpif_probe_complete();
+               err = vpif_probe_complete();
+               if (err) {
+                       goto probe_subdev_out;
+               }
        } else {
                vpif_obj.notifier.subdevs = vpif_obj.config->asd;
                vpif_obj.notifier.num_subdevs = vpif_obj.config->asd_sizes[0];
@@ -1334,6 +1340,8 @@ probe_subdev_out:
        kfree(vpif_obj.sd);
 vpif_unregister:
        v4l2_device_unregister(&vpif_obj.v4l2_dev);
+vpif_free:
+       free_vpif_objs();
 
        return err;
 }
@@ -1355,8 +1363,8 @@ static int vpif_remove(struct platform_d
                ch = vpif_obj.dev[i];
                /* Unregister video device */
                video_unregister_device(&ch->video_dev);
-               kfree(vpif_obj.dev[i]);
        }
+       free_vpif_objs();
 
        return 0;
 }