IB/hfi1: Call kobject_put() when kobject_init_and_add() fails

commit dfb5394f804ed4fcea1fc925be275a38d66712ab upstream.

When kobject_init_and_add() returns an error in the function
hfi1_create_port_files(), the function kobject_put() is not called for the
corresponding kobject, which potentially leads to memory leak.

This patch fixes the issue by calling kobject_put() even if
kobject_init_and_add() fails.

Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200326163813.21129.44280.stgit@awfm-01.aw.intel.com
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/infiniband/hw/hfi1/sysfs.c b/drivers/infiniband/hw/hfi1/sysfs.c
index 621b60ab74eefb11de5a7196ee45b6c5c85e5c3e..26dc66cd85c955a6c03799d310ed452d7eab34a7 100644 (file)
--- a/drivers/infiniband/hw/hfi1/sysfs.c
+++ b/drivers/infiniband/hw/hfi1/sysfs.c
@@ -670,7 +670,11 @@ int hfi1_create_port_files(struct ib_device *ibdev, u8 port_num,
                dd_dev_err(dd,
                           "Skipping sc2vl sysfs info, (err %d) port %u\n",
                           ret, port_num);
-               goto bail;
+               /*
+                * Based on the documentation for kobject_init_and_add(), the
+                * caller should call kobject_put even if this call fails.
+                */
+               goto bail_sc2vl;
        }
        kobject_uevent(&ppd->sc2vl_kobj, KOBJ_ADD);
 
@@ -680,7 +684,7 @@ int hfi1_create_port_files(struct ib_device *ibdev, u8 port_num,
                dd_dev_err(dd,
                           "Skipping sl2sc sysfs info, (err %d) port %u\n",
                           ret, port_num);
-               goto bail_sc2vl;
+               goto bail_sl2sc;
        }
        kobject_uevent(&ppd->sl2sc_kobj, KOBJ_ADD);
 
@@ -690,7 +694,7 @@ int hfi1_create_port_files(struct ib_device *ibdev, u8 port_num,
                dd_dev_err(dd,
                           "Skipping vl2mtu sysfs info, (err %d) port %u\n",
                           ret, port_num);
-               goto bail_sl2sc;
+               goto bail_vl2mtu;
        }
        kobject_uevent(&ppd->vl2mtu_kobj, KOBJ_ADD);
 
@@ -700,7 +704,7 @@ int hfi1_create_port_files(struct ib_device *ibdev, u8 port_num,
                dd_dev_err(dd,
                           "Skipping Congestion Control sysfs info, (err %d) port %u\n",
                           ret, port_num);
-               goto bail_vl2mtu;
+               goto bail_cc;
        }
 
        kobject_uevent(&ppd->pport_cc_kobj, KOBJ_ADD);
@@ -738,7 +742,6 @@ bail_sl2sc:
        kobject_put(&ppd->sl2sc_kobj);
 bail_sc2vl:
        kobject_put(&ppd->sc2vl_kobj);
-bail:
        return ret;
 }