scsi: Revert "scsi: iscsi: Fix HW conn removal use after free"

This reverts commit c577ab7ba5f3bf9062db8a58b6e89d4fe370447e.

The invocation of iscsi_put_conn() in iscsi_iter_destory_conn_fn() is
used to free the initial reference counter of iscsi_cls_conn.  For
non-qla4xxx cases, the ->destroy_conn() callback (e.g.,
iscsi_conn_teardown) will call iscsi_remove_conn() and iscsi_put_conn()
to remove the connection from the children list of session and free the
connection at last.  However for qla4xxx, it is not the case. The
->destroy_conn() callback of qla4xxx will keep the connection in the
session conn_list and doesn't use iscsi_put_conn() to free the initial
reference counter. Therefore, it seems necessary to keep the
iscsi_put_conn() in the iscsi_iter_destroy_conn_fn(), otherwise, there
will be memory leak problem.

Link: https://lore.kernel.org/all/88334658-072b-4b90-a949-9c74ef93cfd1@huawei.com/
Fixes: c577ab7ba5f3 ("scsi: iscsi: Fix HW conn removal use after free")
Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
Link: https://lore.kernel.org/r/20250715073926.3529456-1-lilingfeng3@huawei.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 0b8c91bf793fcbe25ceb73be4970668fb68b25fa..a9ae947f905c7deba026a225236af35b8d8936a2 100644 (file)
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -2143,6 +2143,8 @@ static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
                return 0;
 
        iscsi_remove_conn(iscsi_dev_to_conn(dev));
+       iscsi_put_conn(iscsi_dev_to_conn(dev));
+
        return 0;
 }