tcm_fc: Do not free tpg structure during wq allocation failure

BugLink: http://bugs.launchpad.net/bugs/981162

commit 06383f10c49f507220594a455c6491ca6f8c94ab upstream.

Avoid freeing a registered tpg structure if an alloc_workqueue call
fails.  This fixes a bug where the failure was leaking memory associated
with se_portal_group setup during the original core_tpg_register() call.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Acked-by: Kiran Patil <Kiran.patil@intel.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/drivers/target/tcm_fc/tfc_conf.c b/drivers/target/tcm_fc/tfc_conf.c
index 9402b73..7962325 100644 (file)
--- a/drivers/target/tcm_fc/tfc_conf.c
+++ b/drivers/target/tcm_fc/tfc_conf.c
@@ -304,6 +304,7 @@ static struct se_portal_group *ft_add_tpg(
 {
        struct ft_lport_acl *lacl;
        struct ft_tpg *tpg;
+       struct workqueue_struct *wq;
        unsigned long index;
        int ret;
 
@@ -325,18 +326,20 @@ static struct se_portal_group *ft_add_tpg(
        tpg->lport_acl = lacl;
        INIT_LIST_HEAD(&tpg->lun_list);
 
-       ret = core_tpg_register(&ft_configfs->tf_ops, wwn, &tpg->se_tpg,
-                               tpg, TRANSPORT_TPG_TYPE_NORMAL);
-       if (ret < 0) {
+       wq = alloc_workqueue("tcm_fc", 0, 1);
+       if (!wq) {
                kfree(tpg);
                return NULL;
        }
 
-       tpg->workqueue = alloc_workqueue("tcm_fc", 0, 1);
-       if (!tpg->workqueue) {
+       ret = core_tpg_register(&ft_configfs->tf_ops, wwn, &tpg->se_tpg,
+                               tpg, TRANSPORT_TPG_TYPE_NORMAL);
+       if (ret < 0) {
+               destroy_workqueue(wq);
                kfree(tpg);
                return NULL;
        }
+       tpg->workqueue = wq;
 
        mutex_lock(&ft_lport_lock);
        list_add_tail(&tpg->list, &lacl->tpg_list);