block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern

mainline inclusion
from mainline-v5.17-rc5
commit cc8f7fe1
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4Z2IA


CVE: CVE-2022-0494

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

Add __GFP_ZERO flag for alloc_page in function bio_copy_kern to initialize
the buffer of a bio.

Signed-off-by: Haimin Zhang <tcs.kernel@gmail.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220216084038.15635-1-tcs.kernel@gmail.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>

Conflict: commit ce288e05 ("block: remove BLK_BOUNCE_ISA support")
is not backported.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>