scsi: libiscsi: Fix UAF in iscsi_conn_get_param()/iscsi_conn_teardown()
|- iscsi_if_destroy_conn |-dev_attr_show |-iscsi_conn_teardown |-spin_lock_bh |-iscsi_sw_tcp_conn_get_param |-kfree(conn->persistent_address) |-iscsi_conn_get_param |-kfree(conn->local_ipaddr) ==>|-read persistent_address ==>|-read local_ipaddr |-spin_unlock_bh When iscsi_conn_teardown() and iscsi_conn_get_param() happen in parallel, a UAF may be triggered. Link: https://lore.kernel.org/r/046ec8a0-ce95-d3fc-3235-666a7c65b224@huawei.com Reported-by: Lu Tixiong <lutianxiong@huawei.com> Reviewed-by: Mike Christie <michael.christie@oracle.com> Reviewed-by: Lee Duncan <lduncan@suse.com> Signed-off-by: Lixiaokeng <lixiaokeng@huawei.com> Signed-off-by: Linfeilong <linfeilong@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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