[PATCH] powerpc/warp: Fix error handling in pika_dtm_thread

[Christophe Leroy]

Le 16/11/2025 à 03:44, Ma Ke a écrit :
> ***ATTENTION, Sopra Steria Group cannot confirm the identity of this email sender (SPF record failure). This might be a fake email from an attacker, if you have any doubts report and delete the email.***
> 
> ***ATTENTION, Sopra Steria Group ne peut pas confirmer l’identité de l’émetteur de ce message (SPF record failure). Il pourrait s’agir d’un faux message, à détruire si vous avez un doute ***
> 
> pika_dtm_thread() acquires client through of_find_i2c_device_by_node()
> but fails to release it in error handling path. This could result in a
> reference count leak, preventing proper cleanup and potentially
> leading to resource exhaustion. Add put_device() to release the
> reference in the error handling path.

It is not really an error path, it is the termination of the kthread.

> 
> Found by code review.
> 
> Cc: stable at vger.kernel.org
> Fixes: 3984114f0562 ("powerpc/warp: Platform fix for i2c change")
> Signed-off-by: Ma Ke <make24 at iscas.ac.cn>

Reviewed-by: Christophe Leroy <christophe.leroy at csgroup.eu>

> ---
>   arch/powerpc/platforms/44x/warp.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/powerpc/platforms/44x/warp.c b/arch/powerpc/platforms/44x/warp.c
> index a5001d32f978..6f674f86dc85 100644
> --- a/arch/powerpc/platforms/44x/warp.c
> +++ b/arch/powerpc/platforms/44x/warp.c
> @@ -293,6 +293,8 @@ static int pika_dtm_thread(void __iomem *fpga)
>                  schedule_timeout(HZ);
>          }
> 
> +       put_device(&client->dev);
> +
>          return 0;
>   }
> 
> --
> 2.17.1
>