RDMA/core: Fix several reference count leaks.

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 ("net-sysfs: Fix reference count leak in
rx|netdev_queue_add_kobject") fixed a similar problem.

Link: https://lore.kernel.org/r/20200528030231.9082-1-wu000273@umn.edu
Signed-off-by: Qiushi Wu <wu000273@umn.edu>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
index 087682e..defe9cd 100644 (file)
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c
@@ -1058,8 +1058,7 @@ static int add_port(struct ib_core_device *coredev, int port_num)
                                   coredev->ports_kobj,
                                   "%d", port_num);
        if (ret) {
-               kfree(p);
-               return ret;
+               goto err_put;
        }
 
        p->gid_attr_group = kzalloc(sizeof(*p->gid_attr_group), GFP_KERNEL);
@@ -1072,8 +1071,7 @@ static int add_port(struct ib_core_device *coredev, int port_num)
        ret = kobject_init_and_add(&p->gid_attr_group->kobj, &gid_attr_type,
                                   &p->kobj, "gid_attrs");
        if (ret) {
-               kfree(p->gid_attr_group);
-               goto err_put;
+               goto err_put_gid_attrs;
        }
 
        if (device->ops.process_mad && is_full_dev) {
@@ -1404,8 +1402,10 @@ int ib_port_register_module_stat(struct ib_device *device, u8 port_num,
 
                ret = kobject_init_and_add(kobj, ktype, &port->kobj, "%s",
                                           name);
-               if (ret)
+               if (ret) {
+                       kobject_put(kobj);
                        return ret;
+               }
        }
 
        return 0;