[PATCH] scsi: Fix reference count leak in iscsi_boot_create_kobj.

[PATCH] scsi: Fix reference count leak in iscsi_boot_create_kobj.

[wu000273]

From: Qiushi Wu <wu000273@umn.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@umn.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;
-- 
2.17.1

Re: [PATCH] scsi: Fix reference count leak in iscsi_boot_create_kobj.

[Lee Duncan]

On 5/28/20 1:13 PM, wu000273@umn.edu wrote:
> From: Qiushi Wu <wu000273@umn.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@umn.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@suse.com>

Re: [PATCH] scsi: Fix reference count leak in iscsi_boot_create_kobj.

[Martin K. Petersen]

On Thu, 28 May 2020 15:13:53 -0500, wu000273@umn.edu wrote:

> 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().

Applied to 5.8/scsi-queue, thanks!

[1/1] scsi: iscsi: Fix reference count leak in iscsi_boot_create_kobj
      https://git.kernel.org/mkp/scsi/c/0267ffce562c

-- 
Martin K. Petersen	Oracle Linux Engineering