linux-kernel - Re: [syzbot] Re: kernel BUG in ocfs2_commit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <676058cf.050a0220.37aaf.0138.GAE@google.com>
Date: Mon, 16 Dec 2024 08:43:59 -0800
From: syzbot <syzbot+c16daba279a1161acfb0@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] Re: kernel BUG in ocfs2_commit_truncate()

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com.

***

Subject: Re: kernel BUG in ocfs2_commit_truncate()
Author: dmantipov@...dex.ru

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 78d4f34e2115b517bcbfe7ec0d018bbbb6f9b0b8

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 395e23920632..deb038e9392a 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -7219,12 +7219,19 @@ int ocfs2_commit_truncate(struct ocfs2_super *osb,
 	struct ocfs2_extent_rec *rec;
 	struct ocfs2_path *path = NULL;
 	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+	u16 tree_depth = le16_to_cpu(di->id2.i_list.l_tree_depth);
 	struct ocfs2_extent_list *root_el = &(di->id2.i_list);
 	u64 refcount_loc = le64_to_cpu(di->i_refcount_loc);
 	struct ocfs2_extent_tree et;
 	struct ocfs2_cached_dealloc_ctxt dealloc;
 	struct ocfs2_refcount_tree *ref_tree = NULL;
 
+	if (unlikely(tree_depth >= OCFS2_MAX_PATH_DEPTH)) {
+		mlog(ML_ERROR, "Corrupted dinode %llu\n",
+		     (unsigned long long)di_bh->b_blocknr);
+		return -EINVAL;
+	}
+
 	ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
 	ocfs2_init_dealloc_ctxt(&dealloc);