linux-kernel - [PATCH] scsi: fcoe: Fix transport not deattached when fcoe_if

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Date:   Tue, 15 Nov 2022 17:24:42 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>
CC:     <chenzhongjin@...wei.com>, <hare@...e.de>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <robert.w.love@...el.com>,
        <yi.zou@...el.com>, <James.Bottomley@...e.de>,
        <bprakash@...adcom.com>
Subject: [PATCH] scsi: fcoe: Fix transport not deattached when fcoe_if_init() fails

fcoe_init() calls fcoe_transport_attach(&fcoe_sw_transport), but when
fcoe_if_init() fails, &fcoe_sw_transport is not detached and leave freed
&fcoe_sw_transport on list fcoe_transports, which causes panic when
reinserting module.

 BUG: unable to handle page fault for address: fffffbfff82e2213
 RIP: 0010:fcoe_transport_attach+0xe1/0x230 [libfcoe]
 Call Trace:
  <TASK>
  do_one_initcall+0xd0/0x4e0
  load_module+0x5eee/0x7210
  ...

Fixes: 78a582463c1e ("[SCSI] fcoe: convert fcoe.ko to become an fcoe transport provider driver")
Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 drivers/scsi/fcoe/fcoe.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index 6ec296321ffc..38774a272e62 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -2491,6 +2491,7 @@ static int __init fcoe_init(void)
 
 out_free:
 	mutex_unlock(&fcoe_config_mutex);
+	fcoe_transport_detach(&fcoe_sw_transport);
 out_destroy:
 	destroy_workqueue(fcoe_wq);
 	return rc;
-- 
2.17.1