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ocfs2: validate l_tree_depth to avoid out-of-bounds access

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[ Upstream commit a406aff8c05115119127c962cbbbbd202e1973ef ]

The l_tree_depth field is 16-bit (__le16), but the actual maximum depth is
limited to OCFS2_MAX_PATH_DEPTH.

Add a check to prevent out-of-bounds access if l_tree_depth has an invalid
value, which may occur when reading from a corrupted mounted disk [1].

Link: https://lkml.kernel.org/r/20250214084908.736528-1-kovalev@altlinux.org
Fixes: ccd979bdbc ("[PATCH] OCFS2: The Second Oracle Cluster Filesystem")
Signed-off-by: Vasiliy Kovalev <kovalev@altlinux.org>
Reported-by: syzbot+66c146268dc88f4341fd@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=66c146268dc88f4341fd [1]
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.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>
Cc: Kurt Hackel <kurt.hackel@oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Vasiliy Kovalev <kovalev@altlinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vasiliy Kovalev 2025-02-14 11:49:08 +03:00 committed by Greg Kroah-Hartman
parent 7b9d5f73e7
commit 11e24802e7
1 changed files with 8 additions and 0 deletions
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8
fs/ocfs2/alloc.c
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@ -1796,6 +1796,14 @@ static int __ocfs2_find_path(struct ocfs2_caching_info *ci,
el = root_el;
while (el->l_tree_depth) {
if (unlikely(le16_to_cpu(el->l_tree_depth) >= OCFS2_MAX_PATH_DEPTH)) {
ocfs2_error(ocfs2_metadata_cache_get_super(ci),
"Owner %llu has invalid tree depth %u in extent list\n",
(unsigned long long)ocfs2_metadata_cache_owner(ci),
le16_to_cpu(el->l_tree_depth));
ret = -EROFS;
goto out;
}
if (le16_to_cpu(el->l_next_free_rec) == 0) {
ocfs2_error(ocfs2_metadata_cache_get_super(ci),
"Owner %llu has empty extent list at depth %u\n",