ubifs: Set page uptodate in the correct place

stable inclusion
from stable-v5.10.215
commit 8f599ab6fabbca4c741107eade70722a98adfd9f
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9Q97O
CVE: CVE-2024-35821

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8f599ab6fabbca4c741107eade70722a98adfd9f



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[ Upstream commit 723012cab779eee8228376754e22c6594229bf8f ]

Page cache reads are lockless, so setting the freshly allocated page
uptodate before we've overwritten it with the data it's supposed to have
in it will allow a simultaneous reader to see old data.  Move the call
to SetPageUptodate into ubifs_write_end(), which is after we copied the
new data into the page.

Fixes: 1e51764a ("UBIFS: add new flash file system")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Conflicts:
    fs/ubifs/file.c
[Conflicting patch 3b67db8a ("ubifs: Fix to add refcount once page
is set private") is not adapted and merged into the current branch.]
Signed-off-by: Wang Zhaolong <wangzhaolong1@huawei.com>