diff options
| author | Vasiliy Kovalev <kovalev@altlinux.org> | 2025-02-14 11:49:08 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-03-16 23:24:12 -0700 |
| commit | a406aff8c05115119127c962cbbbbd202e1973ef (patch) | |
| tree | fb97442484bd7da2c414b5d5f1150864d16bf44f | |
| parent | b4dc0bee2a749083028afba346910e198653f42a (diff) | |
ocfs2: validate l_tree_depth to avoid out-of-bounds access
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: ccd979bdbce9 ("[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>
| -rw-r--r-- | fs/ocfs2/alloc.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c index 4414743b638e..b8ac85b548c7 100644 --- a/fs/ocfs2/alloc.c +++ b/fs/ocfs2/alloc.c @@ -1803,6 +1803,14 @@ 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", |