[PATCH] ALSA: pcmtest: fix reference leak on failed device registration

Guangshuo Li
2026-04-15T19:31:47Z

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

mod_init()
-> platform_device_register(&pcmtst_pdev)
-> device_initialize(&pcmtst_pdev.dev)
-> setup_pdev_dma_masks(&pcmtst_pdev)
-> platform_device_add(&pcmtst_pdev)

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: 315a3d57c64c5 ("ALSA: Implement the new Virtual PCM Test Driver")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
sound/drivers/pcmtest.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/drivers/pcmtest.c b/sound/drivers/pcmtest.c
index 768bb698adfb..20ceb9082fa9 100644
--- a/sound/drivers/pcmtest.c
+++ b/sound/drivers/pcmtest.c
@@ -756,8 +756,10 @@ static int __init mod_init(void)
if (err)
return err;
err = platform_device_register(&pcmtst_pdev);
- if (err)
+ if (err) {
+ platform_device_put(&pcmtst_pdev);
return err;
+ }
err = platform_driver_register(&pcmtst_pdrv);
if (err)
platform_device_unregister(&pcmtst_pdev);
--
2.43.0