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scsi: iscsi: Fix possible memory leak when device_register() failed

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If device_register() returns error, the name allocated by the
dev_set_name() need be freed. As described in the comment of
device_register(), we should use put_device() to give up the reference in
the error path.

Fix this by calling put_device(), the name will be freed in the
kobject_cleanup(), and this patch modified resources will be released by
calling the corresponding callback function in the device_release().

Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com>
Link: https://lore.kernel.org/r/20221110033729.1555-1-zhouguanghui1@huawei.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Zhou Guanghui 2022-11-10 03:37:29 +00:00 committed by Martin K. Petersen
parent 0954256e97
commit f014165faa
1 changed files with 16 additions and 15 deletions
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31
drivers/scsi/scsi_transport_iscsi.c
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@ -231,7 +231,7 @@ iscsi_create_endpoint(int dd_size)
dev_set_name(&ep->dev, "ep-%d", id);
err = device_register(&ep->dev);
if (err)
goto free_id;
goto put_dev;
err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
if (err)
@ -245,10 +245,12 @@ unregister_dev:
device_unregister(&ep->dev);
return NULL;
free_id:
put_dev:
mutex_lock(&iscsi_ep_idr_mutex);
idr_remove(&iscsi_ep_idr, id);
mutex_unlock(&iscsi_ep_idr_mutex);
put_device(&ep->dev);
return NULL;
free_ep:
kfree(ep);
return NULL;
@ -766,7 +768,7 @@ iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
err = device_register(&iface->dev);
if (err)
goto free_iface;
goto put_dev;
err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
if (err)
@ -780,9 +782,8 @@ unreg_iface:
device_unregister(&iface->dev);
return NULL;
free_iface:
put_device(iface->dev.parent);
kfree(iface);
put_dev:
put_device(&iface->dev);
return NULL;
}
EXPORT_SYMBOL_GPL(iscsi_create_iface);
@ -1251,15 +1252,15 @@ iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
err = device_register(&fnode_sess->dev);
if (err)
goto free_fnode_sess;
goto put_dev;
if (dd_size)
fnode_sess->dd_data = &fnode_sess[1];
return fnode_sess;
free_fnode_sess:
kfree(fnode_sess);
put_dev:
put_device(&fnode_sess->dev);
return NULL;
}
EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
@ -1299,15 +1300,15 @@ iscsi_create_flashnode_conn(struct Scsi_Host *shost,
err = device_register(&fnode_conn->dev);
if (err)
goto free_fnode_conn;
goto put_dev;
if (dd_size)
fnode_conn->dd_data = &fnode_conn[1];
return fnode_conn;
free_fnode_conn:
kfree(fnode_conn);
put_dev:
put_device(&fnode_conn->dev);
return NULL;
}
EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
@ -4815,7 +4816,7 @@ iscsi_register_transport(struct iscsi_transport *tt)
dev_set_name(&priv->dev, "%s", tt->name);
err = device_register(&priv->dev);
if (err)
goto free_priv;
goto put_dev;
err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
if (err)
@ -4850,8 +4851,8 @@ iscsi_register_transport(struct iscsi_transport *tt)
unregister_dev:
device_unregister(&priv->dev);
return NULL;
free_priv:
kfree(priv);
put_dev:
put_device(&priv->dev);
return NULL;
}
EXPORT_SYMBOL_GPL(iscsi_register_transport);