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Wed, 10 Dec 2025 10:40:30 -0800 (PST) Received: from localhost.localdomain ([111.125.240.40]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29eea06b49csm588205ad.95.2025.12.10.10.40.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Dec 2025 10:40:30 -0800 (PST) From: Prithvi Tambewagh To: syzbot+c818e5c4559444f88aa0@syzkaller.appspotmail.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, mark@fasheh.com Cc: linux-kernel@vger.kernel.org, ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com, Prithvi Tambewagh Subject: Syzbot test for ocfs2: fix kernel BUG in ocfs2_write_block Date: Thu, 11 Dec 2025 00:10:07 +0530 Message-ID: <20251210184014.22798-1-activprithvi@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <66eb6a0e.050a0220.115905.001b.GAE@google.com> References: <66eb6a0e.050a0220.115905.001b.GAE@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 = 24172e0d79900908cf5ebf366600616d29c9b417 Signed-off-by: Prithvi Tambewagh Reported-by: syzbot+c818e5c4559444f88aa0@syzkaller.appspotmail.com Tested-by: syzbot+c818e5c4559444f88aa0@syzkaller.appspotmail.com --- fs/ocfs2/slot_map.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c index e544c704b583..e916a2e8f92d 100644 --- a/fs/ocfs2/slot_map.c +++ b/fs/ocfs2/slot_map.c @@ -193,6 +193,16 @@ static int ocfs2_update_disk_slot(struct ocfs2_super *= osb, else ocfs2_update_disk_slot_old(si, slot_num, &bh); spin_unlock(&osb->osb_lock); + if (bh->b_blocknr < OCFS2_SUPER_BLOCK_BLKNO) { + status =3D ocfs2_error(osb->sb, + "Invalid Slot Map Buffer Head " + "Block Number : %llu, Should be >=3D %d", + (unsigned long long)bh->b_blocknr, + OCFS2_SUPER_BLOCK_BLKNO); + if (!status) + return -EIO; + return status; + } =20 status =3D ocfs2_write_block(osb, bh, INODE_CACHE(si->si_inode)); if (status < 0) base-commit: 24172e0d79900908cf5ebf366600616d29c9b417 --=20 2.43.0