linux-kernel - [PATCH 3/3] scsi: fcoe: clear FC_RP_STARTED flags when receiving a LOGO

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Message-Id: <20180731134603.20089-4-jthumshirn@suse.de>
Date:   Tue, 31 Jul 2018 15:46:03 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux SCSI Mailinglist <linux-scsi@...r.kernel.org>,
        ard <ard@...ak.net>, Johannes Thumshirn <jthumshirn@...e.de>
Subject: [PATCH 3/3] scsi: fcoe: clear FC_RP_STARTED flags when receiving a LOGO

When receiving a LOGO request we forget to clear the FC_RP_STARTED
flag before starting the rport delete routine.

As the started flag was not cleared, we're not deleting the rport but
waiting for a restart and thus are keeping the reference count of the
rdata object at 1.

This leads to the following kmemleak report:
unreferenced object 0xffff88006542aa00 (size 512):
  comm "kworker/0:2", pid 24, jiffies 4294899222 (age 226.880s)
  hex dump (first 32 bytes):
    68 96 fe 65 00 88 ff ff 00 00 00 00 00 00 00 00  h..e............
    01 00 00 00 08 00 00 00 02 c5 45 24 ac b8 00 10  ..........E$....
  backtrace:
    [<(____ptrval____)>] fcoe_ctlr_vn_add.isra.5+0x7f/0x770 [libfcoe]
    [<(____ptrval____)>] fcoe_ctlr_vn_recv+0x12af/0x27f0 [libfcoe]
    [<(____ptrval____)>] fcoe_ctlr_recv_work+0xd01/0x32f0 [libfcoe]
    [<(____ptrval____)>] process_one_work+0x7ff/0x1420
    [<(____ptrval____)>] worker_thread+0x87/0xef0
    [<(____ptrval____)>] kthread+0x2db/0x390
    [<(____ptrval____)>] ret_from_fork+0x35/0x40
    [<(____ptrval____)>] 0xffffffffffffffff

Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
Reported-by: ard <ard@...ak.net>
---
 drivers/scsi/libfc/fc_rport.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
index 31d31aad3de1..89b1f1af2fd4 100644
--- a/drivers/scsi/libfc/fc_rport.c
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -2164,6 +2164,7 @@ static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
 		FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
 			     fc_rport_state(rdata));
 
+		rdata->flags &= ~FC_RP_STARTED;
 		fc_rport_enter_delete(rdata, RPORT_EV_STOP);
 		mutex_unlock(&rdata->rp_mutex);
 		kref_put(&rdata->kref, fc_rport_destroy);
-- 
2.16.4