ksmbd: destroy expired sessions

mainline inclusion
from mainline-v6.4-rc1
commit ea174a91
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I74FHK
CVE: CVE-2023-32247

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea174a91893956450510945a0c5d1a10b5323656



--------------------------------

client can indefinitely send smb2 session setup requests with
the SessionId set to 0, thus indefinitely spawning new sessions,
and causing indefinite memory usage. This patch limit to the number
of sessions using expired timeout and session state.

Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-20478
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com>