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Sun, 30 Nov 2025 23:38:03 -0800 (PST) Received: from localhost.localdomain ([114.79.136.226]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3477b7341d2sm12108159a91.11.2025.11.30.23.37.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 30 Nov 2025 23:38:03 -0800 (PST) From: Prithvi Tambewagh To: syzbot+96d38c6e1655c1420a72@syzkaller.appspotmail.com, joseph.qi@linux.alibaba.com, jlbec@evilplan.org, mark@fasheh.com Cc: linux-kernel@vger.kernel.org, ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com, Prithvi Tambewagh Subject: Syzbot test for v2 for fs: ocfs2: fix kernel BUG in ocfs2_find_victim_chain Date: Mon, 1 Dec 2025 13:07:53 +0530 Message-Id: <20251201073753.48638-1-activprithvi@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <000000000000560ff106204134d2@google.com> References: <000000000000560ff106204134d2@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" #syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git = 939f15e640f193616691d3bcde0089760e75b0d3 Signed-off-by: Prithvi Tambewagh Reported-by: syzbot+96d38c6e1655c1420a72@syzkaller.appspotmail.com Tested-by: syzbot+96d38c6e1655c1420a72@syzkaller.appspotmail.com --- fs/ocfs2/suballoc.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c index 6ac4dcd54588..f4e4ef08e0f9 100644 --- a/fs/ocfs2/suballoc.c +++ b/fs/ocfs2/suballoc.c @@ -1992,6 +1992,13 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_al= loc_context *ac, } =20 cl =3D (struct ocfs2_chain_list *) &fe->id2.i_chain; + if (!le16_to_cpu(cl->cl_next_free_rec) || + le16_to_cpu(cl->cl_next_free_rec) > le16_to_cpu(cl->cl_count)) { + status =3D ocfs2_error(ac->ac_inode->i_sb, + "Chain allocator dinode %llu has 0 chains\n", + (unsigned long long)le64_to_cpu(fe->i_blkno)); + goto bail; + } =20 victim =3D ocfs2_find_victim_chain(cl); ac->ac_chain =3D victim; base-commit: 939f15e640f193616691d3bcde0089760e75b0d3 --=20 2.34.1