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ocfs2: add extra consistency check to ocfs2_dx_dir_lookup_rec()

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In 'ocfs2_dx_dir_lookup_rec()', check whether an extent list length of the
directory indexing block matches the one configured via the superblock
parameters established at mount, thus preventing an out-of-bounds accesses
while iterating over the extent records below.

Link: https://lkml.kernel.org/r/20251007094626.196143-1-dmantipov@yandex.ru
Reported-by: syzbot+30b53487d00b4f7f0922@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=30b53487d00b4f7f0922
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reviewed-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: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Dmitry Antipov
2025-10-07 12:46:26 +03:00
committed by Andrew Morton
parent 2f26f58df0
commit 1b34743c31
1 changed files with 8 additions and 0 deletions
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8
fs/ocfs2/dir.c
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@@ -778,6 +778,14 @@ static int ocfs2_dx_dir_lookup_rec(struct inode *inode,
struct ocfs2_extent_block *eb;
struct ocfs2_extent_rec *rec = NULL;
if (le16_to_cpu(el->l_count) !=
ocfs2_extent_recs_per_dx_root(inode->i_sb)) {
ret = ocfs2_error(inode->i_sb,
"Inode %lu has invalid extent list length %u\n",
inode->i_ino, le16_to_cpu(el->l_count));
goto out;
}
if (el->l_tree_depth) {
ret = ocfs2_find_leaf(INODE_CACHE(inode), el, major_hash,
&eb_bh);