RE: [PATCH 01/12] PM / devfreq: Fix memory leak when fail to register device

MyungJoo Ham
2017-08-28T00:17:53Z

> When the devfreq_add_device fails to register deivce, the memory
> leak of devfreq instance happen. So, this patch fix the memory
> leak issue. Before freeing the devfreq instance checks whether
> devfreq instance is NULL or not because the device_unregister()
> frees the devfreq instance when jumping to the 'err_init'.
> It is to prevent the duplicate the kfee(devfreq).
>
> Cc: stable@vger.kernel.org
> Fixes: ac4b281176a5 ("PM / devfreq: fix duplicated kfree on devfreq pointer")
> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
> ---
> drivers/devfreq/devfreq.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)

This looks like to be duplicated. Please check your repo basis.

Cheers,
MyungJoo

>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index dea04871b50d..a1c4ee818614 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -564,7 +564,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
> err = device_register(&devfreq->dev);
> if (err) {
> mutex_unlock(&devfreq->lock);
> - goto err_out;
> + goto err_dev;
> }
>
> devfreq->trans_table = devm_kzalloc(&devfreq->dev,
> @@ -610,6 +610,9 @@ struct devfreq *devfreq_add_device(struct device *dev,
> mutex_unlock(&devfreq_list_lock);
>
> device_unregister(&devfreq->dev);
> +err_dev:
> + if (devfreq)
> + kfree(devfreq);
> err_out:
> return ERR_PTR(err);
> }
> --
> 1.9.1