+ ocfs2-add-extra-consistency-checks-for-chain-allocator-dinodes.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: ocfs2: add extra consistency checks for chain allocator dinodes
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     ocfs2-add-extra-consistency-checks-for-chain-allocator-dinodes.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ocfs2-add-extra-consistency-checks-for-chain-allocator-dinodes.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Dmitry Antipov <dmantipov@yandex.ru>
Subject: ocfs2: add extra consistency checks for chain allocator dinodes
Date: Tue, 28 Oct 2025 13:14:47 +0300

When validating chain allocator dinode in 'ocfs2_validate_inode_block()',
add an extra checks whether a) the maximum amount of chain records in
'struct ocfs2_chain_list' matches the value calculated based on the
filesystem block size, and b) the next free slot index is within the valid
range.

Link: https://lkml.kernel.org/r/20251028101447.693289-1-dmantipov@yandex.ru
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reported-by: syzbot+77026564530dbc29b854@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=77026564530dbc29b854
Reported-by: syzbot+5054473a31f78f735416@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=5054473a31f78f735416
Suggested-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Heming Zhao <heming.zhao@suse.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ocfs2/inode.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

--- a/fs/ocfs2/inode.c~ocfs2-add-extra-consistency-checks-for-chain-allocator-dinodes
+++ a/fs/ocfs2/inode.c
@@ -1528,6 +1528,23 @@ int ocfs2_validate_inode_block(struct su
 		}
 	}
 
+	if (le32_to_cpu(di->i_flags) & OCFS2_CHAIN_FL) {
+		struct ocfs2_chain_list *cl = &di->id2.i_chain;
+
+		if (le16_to_cpu(cl->cl_count) != ocfs2_chain_recs_per_inode(sb)) {
+			rc = ocfs2_error(sb, "Invalid dinode %llu: chain list count %u\n",
+					 (unsigned long long)bh->b_blocknr,
+					 le16_to_cpu(cl->cl_count));
+			goto bail;
+		}
+		if (le16_to_cpu(cl->cl_next_free_rec) > le16_to_cpu(cl->cl_count)) {
+			rc = ocfs2_error(sb, "Invalid dinode %llu: chain list index %u\n",
+					 (unsigned long long)bh->b_blocknr,
+					 le16_to_cpu(cl->cl_next_free_rec));
+			goto bail;
+		}
+	}
+
 	rc = 0;
 
 bail:
_

Patches currently in -mm which might be from dmantipov@yandex.ru are

ocfs2-add-extra-flags-check-in-ocfs2_ioctl_move_extents.patch
ocfs2-relax-bug-to-ocfs2_error-in-__ocfs2_move_extent.patch
ocfs2-annotate-flexible-array-members-with-__counted_by_le.patch
ocfs2-annotate-flexible-array-members-with-__counted_by_le-fix.patch
ocfs2-add-extra-consistency-check-to-ocfs2_dx_dir_lookup_rec.patch
ocfs2-add-directory-size-check-to-ocfs2_find_dir_space_id.patch
ocfs2-add-boundary-check-to-ocfs2_check_dir_entry.patch
ocfs2-add-inline-inode-consistency-check-to-ocfs2_validate_inode_block.patch
ocfs2-add-extra-consistency-checks-for-chain-allocator-dinodes.patch