linux-kernel - FAILED: Patch "nilfs2: fix kernel bug due to missing clearing of checked flag" failed to apply to v4.19-stable tree

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Message-ID: <20241106021430.184316-1-sashal@kernel.org>
Date: Tue,  5 Nov 2024 21:14:29 -0500
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	konishi.ryusuke@...il.com
Cc: syzbot+d6ca2daf692c7a82f959@...kaller.appspotmail.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-nilfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "nilfs2: fix kernel bug due to missing clearing of checked flag" failed to apply to v4.19-stable tree

The patch below does not apply to the v4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 41e192ad2779cae0102879612dfe46726e4396aa Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi <konishi.ryusuke@...il.com>
Date: Fri, 18 Oct 2024 04:33:10 +0900
Subject: [PATCH] nilfs2: fix kernel bug due to missing clearing of checked
 flag

Syzbot reported that in directory operations after nilfs2 detects
filesystem corruption and degrades to read-only,
__block_write_begin_int(), which is called to prepare block writes, may
fail the BUG_ON check for accesses exceeding the folio/page size,
triggering a kernel bug.

This was found to be because the "checked" flag of a page/folio was not
cleared when it was discarded by nilfs2's own routine, which causes the
sanity check of directory entries to be skipped when the directory
page/folio is reloaded.  So, fix that.

This was necessary when the use of nilfs2's own page discard routine was
applied to more than just metadata files.

Link: https://lkml.kernel.org/r/20241017193359.5051-1-konishi.ryusuke@gmail.com
Fixes: 8c26c4e2694a ("nilfs2: fix issue with flush kernel thread after remount in RO mode because of driver's internal error or metadata corruption")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@...il.com>
Reported-by: syzbot+d6ca2daf692c7a82f959@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=d6ca2daf692c7a82f959
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
 fs/nilfs2/page.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 5436eb0424bd1..10def4b559956 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -401,6 +401,7 @@ void nilfs_clear_folio_dirty(struct folio *folio)

 	folio_clear_uptodate(folio);
 	folio_clear_mappedtodisk(folio);
+	folio_clear_checked(folio);

 	head = folio_buffers(folio);
 	if (head) {
-- 
2.43.0