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

Takashi Iwai
2026-04-17T07:57:22Z

On Wed, 15 Apr 2026 21:31:38 +0200,
Guangshuo Li wrote:
>
> 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>

Thanks, applied now.

Takashi