ksmbd: do not call kvmalloc() with __GFP_NORETRY | __GFP_NO_WARN

mainline inclusion
from mainline-v6.3-rc6
commit e416ea62
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I74FNG
CVE: CVE-2023-2593

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e416ea62a9166e6075a07a970cc5bf79255d2700



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

Commit 83dcedd5 ("ksmbd: fix infinite loop in ksmbd_conn_handler_loop()"),
changes GFP modifiers passed to kvmalloc(). This cause xfstests generic/551
test to fail. We limit pdu length size according to connection status and
maximum number of connections. In the rest, memory allocation of request
is limited by credit management. so these flags are no longer needed.

Fixes: 83dcedd5 ("ksmbd: fix infinite loop in ksmbd_conn_handler_loop()")
Cc: stable@vger.kernel.org
Signed-off-by: Marios Makassikis <mmakassikis@freebox.fr>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com>
(cherry picked from commit b2191bd6)