linux-kernel - [PATCH AUTOSEL 5.18 18/56] scsi: iscsi: Fix HW conn removal use after free

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Message-Id: <20220814153026.2377377-18-sashal@kernel.org>
Date:   Sun, 14 Aug 2022 11:29:48 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mike Christie <michael.christie@...cle.com>,
        Nilesh Javali <njavali@...vell.com>,
        Lee Duncan <lduncan@...e.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>, cleech@...hat.com,
        jejb@...ux.ibm.com, open-iscsi@...glegroups.com,
        linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 5.18 18/56] scsi: iscsi: Fix HW conn removal use after free

From: Mike Christie <michael.christie@...cle.com>

[ Upstream commit c577ab7ba5f3bf9062db8a58b6e89d4fe370447e ]

If qla4xxx doesn't remove the connection before the session, the iSCSI
class tries to remove the connection for it. We were doing a
iscsi_put_conn() in the iter function which is not needed and will result
in a use after free because iscsi_remove_conn() will free the connection.

Link: https://lore.kernel.org/r/20220616222738.5722-2-michael.christie@oracle.com
Tested-by: Nilesh Javali <njavali@...vell.com>
Reviewed-by: Lee Duncan <lduncan@...e.com>
Reviewed-by: Nilesh Javali <njavali@...vell.com>
Signed-off-by: Mike Christie <michael.christie@...cle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/scsi_transport_iscsi.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 5d21f07456c6..6e73f14b9749 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -2143,8 +2143,6 @@ static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
 		return 0;
 
 	iscsi_remove_conn(iscsi_dev_to_conn(dev));
-	iscsi_put_conn(iscsi_dev_to_conn(dev));
-
 	return 0;
 }
 
-- 
2.35.1