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([2405:201:e00c:517f:5e87:9cff:fe63:6000]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-71944b7aeafsm7186476b3a.99.2024.09.18.10.21.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Sep 2024 10:21:03 -0700 (PDT) From: Mohammed Anees To: ocfs2-devel@lists.linux.dev, linux-kernel@vger.kernel.org Cc: Mark Fasheh , Joel Becker , Joseph Qi , Mohammed Anees , syzbot+18a87160c7d64ba2e2f6@syzkaller.appspotmail.com Subject: [PATCH 2/2] osfs2: Fix kernel BUG in ocfs2_write_cluster Date: Wed, 18 Sep 2024 17:20:26 +0000 Message-ID: <20240918172026.2532-3-pvmohammedanees2003@gmail.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240918172026.2532-1-pvmohammedanees2003@gmail.com> References: <20240918172026.2532-1-pvmohammedanees2003@gmail.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" syzbot has found a kernel BUG in ocfs2_write_cluster_by_desc [1]. The issue arises because ocfs2_insert_extent receives start_blk as 0, which incorrectly maps to a physical address of 0. This occurs when block is 0 after the call to ocfs2_clusters_to_blocks which is invoked inside the ocfs2_add_clusters_in_btree. The block value is then passed to ocfs2_insert_extent, leading to the problem. [1] https://syzkaller.appspot.com/bug?extid=3D18a87160c7d64ba2e2f6 Reported-and-tested-by: syzbot+18a87160c7d64ba2e2f6@syzkaller.appspotmail.c= om Closes: https://syzkaller.appspot.com/bug?extid=3D18a87160c7d64ba2e2f6 Signed-off-by: Mohammed Anees --- fs/ocfs2/alloc.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c index 395e23920..926ffeed8 100644 --- a/fs/ocfs2/alloc.c +++ b/fs/ocfs2/alloc.c @@ -4843,6 +4843,13 @@ int ocfs2_add_clusters_in_btree(handle_t *handle, } =20 block =3D ocfs2_clusters_to_blocks(osb->sb, bit_off); + if (block =3D=3D 0) { + mlog(ML_ERROR, "Conversion resulted in zero block number"); + status =3D -EIO; + need_free =3D 1; + goto bail; + } + trace_ocfs2_add_clusters_in_btree( (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), bit_off, num_bits); --=20 2.46.0