media: davinci: vpif_capture: fix memory leak in vpif_probe()

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@gmail.com>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index 61809d2..f0f7ef6 100644 (file)
--- a/drivers/media/platform/davinci/vpif_capture.c
+++ b/drivers/media/platform/davinci/vpif_capture.c
@@ -1376,6 +1376,14 @@ vpif_init_free_channel_objects:
        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 @@ probe_subdev_out:
        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);