linux-kernel - [PATCH] scsi: efct: Fix possible memleak in efct_device

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Date:   Fri, 11 Nov 2022 15:40:46 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <target-devel@...r.kernel.org>
CC:     <james.smart@...adcom.com>, <ram.vegesna@...adcom.com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <christophe.jaillet@...adoo.fr>, <hare@...e.de>, <dwagner@...e.de>,
        <chenzhongjin@...wei.com>
Subject: [PATCH] scsi: efct: Fix possible memleak in efct_device_init()

In efct_device_init(), when efct_scsi_reg_fc_transport() fails,
efct_scsi_tgt_driver_exit() is not called to release memory for
efct_scsi_tgt_driver_init() and causes memleak:

unreferenced object 0xffff8881020ce000 (size 2048):
  comm "modprobe", pid 465, jiffies 4294928222 (age 55.872s)
  backtrace:
    [<0000000021a1ef1b>] kmalloc_trace+0x27/0x110
    [<000000004c3ed51c>] target_register_template+0x4fd/0x7b0 [target_core_mod]
    [<00000000f3393296>] efct_scsi_tgt_driver_init+0x18/0x50 [efct]
    [<00000000115de533>] 0xffffffffc0d90011
    [<00000000d608f646>] do_one_initcall+0xd0/0x4e0
    [<0000000067828cf1>] do_init_module+0x1cc/0x6a0
    ...

Fixes: 4df84e846624 ("scsi: elx: efct: Driver initialization routines")
Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 drivers/scsi/elx/efct/efct_driver.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/elx/efct/efct_driver.c b/drivers/scsi/elx/efct/efct_driver.c
index b08fc8839808..49fd2cfed70c 100644
--- a/drivers/scsi/elx/efct/efct_driver.c
+++ b/drivers/scsi/elx/efct/efct_driver.c
@@ -42,6 +42,7 @@ efct_device_init(void)
 
 	rc = efct_scsi_reg_fc_transport();
 	if (rc) {
+		efct_scsi_tgt_driver_exit();
 		pr_err("failed to register to FC host\n");
 		return rc;
 	}
-- 
2.17.1