From: Chao Yu <chao@kernel.org>
Date: Mon, 12 Jan 2026 07:49:15 +0000 (+0800)
Subject: f2fs: fix to do sanity check on node footer in __write_node_folio()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0a736109c9d29de0c26567e42cb99b27861aa8ba;p=thirdparty%2Fkernel%2Flinux.git

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@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 00587e783b44..30e26b878af0 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;