[PATCH] hwtracing: stm: fix possible double free in stm_register_device()

[Hangyu Hua]

Ping

On 2022/4/18 16:16, Hangyu Hua wrote:
> put_device() will call stm_device_release() to free stm when
> stm_register_device() fails. So there is no need to call vfree() again.
> 
> Fix this by adding a return after put_device().
> 
> Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")
> Signed-off-by: Hangyu Hua <hbh25y at gmail.com>
> ---
>   drivers/hwtracing/stm/core.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
> index 2712e699ba08..403b4f41bb1b 100644
> --- a/drivers/hwtracing/stm/core.c
> +++ b/drivers/hwtracing/stm/core.c
> @@ -915,6 +915,7 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
>   
>   	/* matches device_initialize() above */
>   	put_device(&stm->dev);
> +	return err;
>   err_free:
>   	vfree(stm);
>