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Subject[PATCH] [v3] scsi: zfcp: Fix a double put in zfcp_port_enqueue
Date
When device_register() fails, zfcp_port_release() will be called
after put_device(). As a result, zfcp_ccw_adapter_put() will be
called twice: one in zfcp_port_release() and one in the error path
after device_register(). So the reference on the adapter object is
doubly put, which may lead to a premature free. Fix this by adjusting
the error tag after device_register().

Fixes: f3450c7b9172 ("[SCSI] zfcp: Replace local reference counting with common kref")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---

Changelog:

v2: -Improve the patch description.
-Add a new label 'err_register' to unify code style.

v3: -Improve the names of goto labels.
---
drivers/s390/scsi/zfcp_aux.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index df782646e856..ab2f35bc294d 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -518,12 +518,12 @@ struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
if (port) {
put_device(&port->dev);
retval = -EEXIST;
- goto err_out;
+ goto err_put;
}

port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
if (!port)
- goto err_out;
+ goto err_put;

rwlock_init(&port->unit_list_lock);
INIT_LIST_HEAD(&port->unit_list);
@@ -546,7 +546,7 @@ struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,

if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
kfree(port);
- goto err_out;
+ goto err_put;
}
retval = -EINVAL;

@@ -563,7 +563,8 @@ struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,

return port;

-err_out:
+err_put:
zfcp_ccw_adapter_put(adapter);
+err_out:
return ERR_PTR(retval);
}
--
2.17.1
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