stable inclusion
from stable-v5.10.119
commit 57d01bcae7041cfb86553091718d12bf36c082aa
category: bugfix
bugzilla: 186671, https://gitee.com/src-openeuler/kernel/issues/I56MH6
CVE: CVE-2022-1508

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=57d01bcae7041cfb86553091718d12bf36c082aa

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

We can't re-import or modify iterators from iocb callbacks, it's not
safe as it might be reverted and/or reexpanded while unwinding stack.
It's also not safe to resubmit as io-wq thread will race with stack
undwinding for the iterator and other data.

Disallow resubmission from callbacks, it can fail some cases that were
handled before, but the possibility of such a failure was a part of the
API from the beginning and so it should be fine.
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NGuo Xuenan <guoxuenan@huawei.com>
Reviewed-by: NXiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: NZhang Yi <yi.zhang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>