From: Wenchao Hao <haowenchao@huawei.com> mainline inclusion from mainline-v5.18-rc1 commit 7dae459f5e56a89ab01413ae055595c982713349 category: bugfix bugzilla: 187381, https://gitee.com/openeuler/kernel/issues/I5LBFL CVE: NA -------------------------------- iscsi_create_conn() exposed iscsi_cls_conn to sysfs prior to initialization of iscsi_conn's dd_data. When userspace tried to access an attribute such as the connect address, a NULL pointer dereference was observed. Do not add iscsi_cls_conn to sysfs until it has been initialized. Remove iscsi_create_conn() since it is no longer used. Link: https://lore.kernel.org/r/20220310015759.3296841-3-haowenchao@huawei.com Reviewed-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Wenchao Hao <haowenchao@huawei.com> Signed-off-by: Wu Bo <wubo40@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Conflict: iscsi_create_conn() is not removed Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Jason Yan <yanaijie@huawei.com> Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com> --- drivers/scsi/libiscsi.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index a93a47d4931f..072c6b85cb30 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -3069,8 +3069,9 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, struct iscsi_conn *conn; struct iscsi_cls_conn *cls_conn; char *data; + int err; - cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, + cls_conn = iscsi_alloc_conn(cls_session, sizeof(*conn) + dd_size, conn_idx); if (!cls_conn) return NULL; @@ -3111,13 +3112,21 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, init_waitqueue_head(&session_wrapper->ehwait); + err = iscsi_add_conn(cls_conn); + if (err) + goto login_task_add_dev_fail; + return cls_conn; +login_task_add_dev_fail: + free_pages((unsigned long) conn->data, + get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); + login_task_data_alloc_fail: kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, sizeof(void*)); login_task_alloc_fail: - iscsi_destroy_conn(cls_conn); + iscsi_put_conn(cls_conn); return NULL; } EXPORT_SYMBOL_GPL(iscsi_conn_setup); -- 2.25.1