[PATCH for-next 3/4] RDMA/rtrs-srv: fix memory leak by missing kobject free

[Jack Wang <jinpu.wang@cloud.ionos.com>]

From: Gioh Kim <gi-oh.kim@cloud.ionos.com>

kmemleak reported an error as below:

unreferenced object 0xffff8880674b7640 (size 64):
  comm "kworker/4:1H", pid 113, jiffies 4296403507 (age 507.840s)
  hex dump (first 32 bytes):
    69 70 3a 31 39 32 2e 31 36 38 2e 31 32 32 2e 31  ip:192.168.122.1
    31 30 40 69 70 3a 31 39 32 2e 31 36 38 2e 31 32  10@ip:192.168.12
  backtrace:
    [<0000000054413611>] kstrdup+0x2e/0x60
    [<0000000078e3120a>] kobject_set_name_vargs+0x2f/0xb0
    [<00000000ca2be3ee>] kobject_init_and_add+0xb0/0x120
    [<0000000062ba5e78>] rtrs_srv_create_sess_files+0x14c/0x314 [rtrs_server]
    [<00000000b45b7217>] rtrs_srv_info_req_done+0x5b1/0x800 [rtrs_server]
    [<000000008fc5aa8f>] __ib_process_cq+0x94/0x100 [ib_core]
    [<00000000a9599cb4>] ib_cq_poll_work+0x32/0xc0 [ib_core]
    [<00000000cfc376be>] process_one_work+0x4bc/0x980
    [<0000000016e5c96a>] worker_thread+0x78/0x5c0
    [<00000000c20b8be0>] kthread+0x191/0x1e0
    [<000000006c9c0003>] ret_from_fork+0x3a/0x50

It is caused by the not-freed kobject of rtrs_srv_sess.
The kobject embedded in rtrs_srv_sess has ref-counter 2 after calling
process_info_req(). Therefore it must call kobject_put twice.
Currently it calls kobject_put only once at rtrs_srv_destroy_sess_files
because kobject_del removes the state_in_sysfs flag and then
kobject_put in free_sess() is not called.

This patch moves kobject_del() into free_sess() so that the kobject
of rtrs_srv_sess can be freed. And also this patch adds the missing
call of sysfs_remove_group() to clean-up the sysfs directory.

Fixes: 9cb837480424 ("RDMA/rtrs: server: main functionality")
Signed-off-by: Gioh Kim <gi-oh.kim@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
 drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c | 2 +-
 drivers/infiniband/ulp/rtrs/rtrs-srv.c       | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c b/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c
index 0a3886629cae..94e3f3290500 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c
@@ -305,7 +305,7 @@ void rtrs_srv_destroy_sess_files(struct rtrs_srv_sess *sess)
 	if (sess->kobj.state_in_sysfs) {
 		kobject_del(&sess->stats->kobj_stats);
 		kobject_put(&sess->stats->kobj_stats);
-		kobject_del(&sess->kobj);
+		sysfs_remove_group(&sess->kobj, &rtrs_srv_sess_attr_group);
 		kobject_put(&sess->kobj);
 
 		rtrs_srv_destroy_once_sysfs_root_folders(sess);
diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv.c b/drivers/infiniband/ulp/rtrs/rtrs-srv.c
index 2538a84fe5fc..3f1b4ce3c055 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-srv.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-srv.c
@@ -1477,10 +1477,12 @@ static bool __is_path_w_addr_exists(struct rtrs_srv *srv,
 
 static void free_sess(struct rtrs_srv_sess *sess)
 {
-	if (sess->kobj.state_in_sysfs)
+	if (sess->kobj.state_in_sysfs) {
+		kobject_del(&sess->kobj);
 		kobject_put(&sess->kobj);
-	else
+	} else {
 		kfree(sess);
+	}
 }
 
 static void rtrs_srv_close_work(struct work_struct *work)
-- 
2.25.1