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scsi: iscsi_tcp: Check that sock is valid before iscsi_set_param()

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[ Upstream commit 48b19b79cf ]

The validity of sock should be checked before assignment to avoid incorrect
values. Commit 57569c37f0 ("scsi: iscsi: iscsi_tcp: Fix null-ptr-deref
while calling getpeername()") introduced this change which may lead to
inconsistent values of tcp_sw_conn->sendpage and conn->datadgst_en.

Fix the issue by moving the position of the assignment.

Fixes: 57569c37f0 ("scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()")
Signed-off-by: Zhong Jinghua <zhongjinghua@huawei.com>
Link: https://lore.kernel.org/r/20230329071739.2175268-1-zhongjinghua@huaweicloud.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhong Jinghua 2023-03-29 15:17:39 +08:00 committed by Greg Kroah-Hartman
parent ae73c4dd48
commit 5e5c5f4729
1 changed files with 1 additions and 2 deletions
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3
drivers/scsi/iscsi_tcp.c
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@ -767,13 +767,12 @@ static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
iscsi_set_param(cls_conn, param, buf, buflen);
break;
case ISCSI_PARAM_DATADGST_EN:
iscsi_set_param(cls_conn, param, buf, buflen);
mutex_lock(&tcp_sw_conn->sock_lock);
if (!tcp_sw_conn->sock) {
mutex_unlock(&tcp_sw_conn->sock_lock);
return -ENOTCONN;
}
iscsi_set_param(cls_conn, param, buf, buflen);
tcp_sw_conn->sendpage = conn->datadgst_en ?
sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
mutex_unlock(&tcp_sw_conn->sock_lock);