[PATCH] media: vidtv: fix reference leak on failed device registration

[Guangshuo Li]

When platform_device_register() fails in vidtv_bridge_init(), the
embedded struct device in vidtv_bridge_dev has already been initialized
by device_initialize(), but the failure path returns the error without
dropping the device reference for the current platform device:

  vidtv_bridge_init()
    -> platform_device_register(&vidtv_bridge_dev)
       -> device_initialize(&vidtv_bridge_dev.dev)
       -> setup_pdev_dma_masks(&vidtv_bridge_dev)
       -> platform_device_add(&vidtv_bridge_dev)

This leads to a reference leak when platform_device_register() fails.
Fix this by calling platform_device_put() before returning the error.

The issue was identified by a static analysis tool I developed and
confirmed by manual review.

Fixes: f90cf6079bf67 ("media: vidtv: add a bridge driver")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/media/test-drivers/vidtv/vidtv_bridge.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/test-drivers/vidtv/vidtv_bridge.c b/drivers/media/test-drivers/vidtv/vidtv_bridge.c
index b6203e10e37a..0b551981a5b2 100644
--- a/drivers/media/test-drivers/vidtv/vidtv_bridge.c
+++ b/drivers/media/test-drivers/vidtv/vidtv_bridge.c
@@ -592,8 +592,10 @@ static int __init vidtv_bridge_init(void)
 	int ret;
 
 	ret = platform_device_register(&vidtv_bridge_dev);
-	if (ret)
+	if (ret) {
+		platform_device_put(&vidtv_bridge_dev);
 		return ret;
+	}
 
 	ret = platform_driver_register(&vidtv_bridge_driver);
 	if (ret)
-- 
2.43.0