linux-kernel - [PATCH v5 1/3] f2fs: fix to do sanity check on node footer in __write_node

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Message-Id: <20260112074917.40107-1-chao@kernel.org>
Date: Mon, 12 Jan 2026 15:49:15 +0800
From: Chao Yu <chao@...nel.org>
To: jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Chao Yu <chao@...nel.org>
Subject: [PATCH v5 1/3] f2fs: fix to do sanity check on node footer in __write_node_folio()

Add node footer sanity check during node folio's writeback, if sanity
check fails, let's shutdown filesystem to avoid looping to redirty
and writeback in .writepages.

Signed-off-by: Chao Yu <chao@...nel.org>
---
v5:
- split original [patch 1/2] to two, in this patch, just use
sanity_check_node_footer() to do sanity check during writeback.
 fs/f2fs/node.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 99e425e8c00a..bd4681a8a646 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1763,7 +1763,11 @@ static bool __write_node_folio(struct folio *folio, bool atomic, bool *submitted
 
 	/* get old block addr of this node page */
 	nid = nid_of_node(folio);
-	f2fs_bug_on(sbi, folio->index != nid);
+
+	if (sanity_check_node_footer(sbi, folio, nid, NODE_TYPE_REGULAR)) {
+		f2fs_handle_critical_error(sbi, STOP_CP_REASON_CORRUPTED_NID);
+		goto redirty_out;
+	}
 
 	if (f2fs_get_node_info(sbi, nid, &ni, !do_balance))
 		goto redirty_out;
-- 
2.40.1