Re: [PATCH] nvme/hwmon: Return error code when registration fails

[Hannes Reinecke]

On 2/12/21 10:30 AM, Daniel Wagner wrote:
> The hwmon pointer wont be NULL if the registration fails. Though the
> exit code path will assign it to ctrl->hwmon_device. Later
> nvme_hwmon_exit() will try to free the invalid pointer. Avoid this by
> returning the error code from hwmon_device_register_with_info().
>
> Fixes: ec420cdcfab4 ("nvme/hwmon: rework to avoid devm allocation")
> Cc: Hannes Reinecke <hare@xxxxxxx>
> Signed-off-by: Daniel Wagner <dwagner@xxxxxxx>
> ---
>
> This patch is against linux-block/for-next.
>
>   drivers/nvme/host/hwmon.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/nvme/host/hwmon.c b/drivers/nvme/host/hwmon.c
> index 8f9e96986780..0a586d712920 100644
> --- a/drivers/nvme/host/hwmon.c
> +++ b/drivers/nvme/host/hwmon.c
> @@ -248,6 +248,7 @@ int nvme_hwmon_init(struct nvme_ctrl *ctrl)
>   	if (IS_ERR(hwmon)) {
>   		dev_warn(dev, "Failed to instantiate hwmon device\n");
>   		kfree(data);
> +		return PTR_ERR(hwmon);
>   	}
>   	ctrl->hwmon_device = hwmon;
>   	return 0;
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke                Kernel Storage Architect
hare@xxxxxxx                              +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer