Re: [PATCH] parisc: led: fix reference leak on failed device registration

[Jiri Slaby <jirislaby@kernel.org>]

On 17. 04. 26, 11:39, Helge Deller wrote:
> On 4/15/26 19:05, Guangshuo Li wrote:
>> When platform_device_register() fails in startup_leds(), the embedded
>> struct device in platform_leds has already been initialized by
>> device_initialize(), but the failure path only reports the error and
>> does not drop the device reference for the current platform device:
>>
>>    startup_leds()
>>      -> platform_device_register(&platform_leds)
>>         -> device_initialize(&platform_leds.dev)
>>         -> setup_pdev_dma_masks(&platform_leds)
>>         -> platform_device_add(&platform_leds)
>>
>> This leads to a reference leak when platform_device_register() fails.
>> Fix this by calling platform_device_put() after reporting the error.
>>
>> The issue was identified by a static analysis tool I developed and
>> confirmed by manual review.
>>
>> Fixes: 789e527adfc33 ("parisc: led: Rewrite LED/LCD driver to 
>> utilizize Linux LED subsystem")
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
>> ---
>>   drivers/parisc/led.c | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> applied.
> Thanks!
> Helge

Unless the static pcmtst_pdev has ->type->release or ->release set, the 
patch triggers a warning upon put().

platform_device_register() should be fixed instead.

See also:
https://patchew.org/linux/20260415174159.3625777-1-lgs201920130244@gmail.com/

thanks,
-- 
js
suse labs