linux-kernel - Re: [PATCH] scsi: Fix reference count leak in iscsi_boot_create

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Message-ID: <2d158fc5-a0b5-718d-d70a-3dfe9db22482@suse.com>
Date:   Fri, 29 May 2020 08:09:38 -0700
From:   Lee Duncan <lduncan@...e.com>
To:     <wu000273@....edu>, <kjlu@....edu>
CC:     Chris Leech <cleech@...hat.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        <open-iscsi@...glegroups.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: Fix reference count leak in iscsi_boot_create_kobj.

On 5/28/20 1:13 PM, wu000273@....edu wrote:
> From: Qiushi Wu <wu000273@....edu>
> 
> kobject_init_and_add() should be handled when it return an error,
> because kobject_init_and_add() takes reference even when it fails.
> If this function returns an error, kobject_put() must be called to
> properly clean up the memory associated with the object. Previous
> commit "b8eb718348b8" fixed a similar problem. Thus replace calling
> kfree() by calling kobject_put().
> 
> Signed-off-by: Qiushi Wu <wu000273@....edu>
> ---
>  drivers/scsi/iscsi_boot_sysfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/iscsi_boot_sysfs.c b/drivers/scsi/iscsi_boot_sysfs.c
> index e4857b728033..a64abe38db2d 100644
> --- a/drivers/scsi/iscsi_boot_sysfs.c
> +++ b/drivers/scsi/iscsi_boot_sysfs.c
> @@ -352,7 +352,7 @@ iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
>  	boot_kobj->kobj.kset = boot_kset->kset;
>  	if (kobject_init_and_add(&boot_kobj->kobj, &iscsi_boot_ktype,
>  				 NULL, name, index)) {
> -		kfree(boot_kobj);
> +		kobject_put(&boot_kobj->kobj);
>  		return NULL;
>  	}
>  	boot_kobj->data = data;
> 

Reviewed-by: Lee Duncan <lduncan@...e.com>