From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7603B305E2E; Wed, 28 Jan 2026 15:52:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769615564; cv=none; b=hvFE0PHEKx0wVLKvWhCiQuPUqv0jpZzyuKawkDupzeDN5J6ZHUGY56uc1QH4i51JwWjEvudblrunAqzMgDslH3qjZnrsdcTaWZfpFZNA66KzCuZaync+cJQBHcITQpLUyqSC3D7PbqIk38OSY1EzJwS/G4ddQZyHAIZ2OLkUyBo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769615564; c=relaxed/simple; bh=ytUou+EXtdYa4NKJvCj2Z+z4urSbpGz7lC81gXRWc7U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CTZyBCIAISIKOsZWeG7MV6eW0IGTgXnSMLdizkKnwHkEwM72vOpdlM9Gs2ttPKOOAVQ9mnWGIHtTRcqlGyFY5obgNU+XpCle89yOvTja3qt0wEkz54jmK4wsPe8HXGPUxKQxsxqf10dUZPvXT313CiOf+VrhqlxwHHLiwWPOT/o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=gsUlJ+eR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="gsUlJ+eR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DF8C2C4CEF1; Wed, 28 Jan 2026 15:52:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1769615564; bh=ytUou+EXtdYa4NKJvCj2Z+z4urSbpGz7lC81gXRWc7U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gsUlJ+eRXfNHoG6WjojuToohfOleG/7AHX9yTvsvrHH/zu5ChXMl3+l6XuqHccWd1 up4ICfVAteCq1D3BNZQrZSrjcYUqPRuCyk66LtlJruVGWancxK8a7mbR/OfP+e63KP tnEL0wc0juTEWY9N08C2p/sC9kkQOuPkQ+M5wm7g= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+9c081b17773615f24672@syzkaller.appspotmail.com, Eric Dumazet , Andrew Lunn , Jay Vosburgh , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.18 029/227] bonding: limit BOND_MODE_8023AD to Ethernet devices Date: Wed, 28 Jan 2026 16:21:14 +0100 Message-ID: <20260128145345.393271103@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260128145344.331957407@linuxfoundation.org> References: <20260128145344.331957407@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit c84fcb79e5dbde0b8d5aeeaf04282d2149aebcf6 ] BOND_MODE_8023AD makes sense for ARPHRD_ETHER only. syzbot reported: BUG: KASAN: global-out-of-bounds in __hw_addr_create net/core/dev_addr_lists.c:63 [inline] BUG: KASAN: global-out-of-bounds in __hw_addr_add_ex+0x25d/0x760 net/core/dev_addr_lists.c:118 Read of size 16 at addr ffffffff8bf94040 by task syz.1.3580/19497 CPU: 1 UID: 0 PID: 19497 Comm: syz.1.3580 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 __hw_addr_create net/core/dev_addr_lists.c:63 [inline] __hw_addr_add_ex+0x25d/0x760 net/core/dev_addr_lists.c:118 __dev_mc_add net/core/dev_addr_lists.c:868 [inline] dev_mc_add+0xa1/0x120 net/core/dev_addr_lists.c:886 bond_enslave+0x2b8b/0x3ac0 drivers/net/bonding/bond_main.c:2180 do_set_master+0x533/0x6d0 net/core/rtnetlink.c:2963 do_setlink+0xcf0/0x41c0 net/core/rtnetlink.c:3165 rtnl_changelink net/core/rtnetlink.c:3776 [inline] __rtnl_newlink net/core/rtnetlink.c:3935 [inline] rtnl_newlink+0x161c/0x1c90 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x820 net/socket.c:2592 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646 __sys_sendmsg+0x164/0x220 net/socket.c:2678 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x1dc/0x560 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the variable: lacpdu_mcast_addr+0x0/0x40 Fixes: 872254dd6b1f ("net/bonding: Enable bonding to enslave non ARPHRD_ETHER") Reported-by: syzbot+9c081b17773615f24672@syzkaller.appspotmail.com Closes: https://lore.kernel.org/netdev/6966946b.a70a0220.245e30.0002.GAE@google.com/T/#u Signed-off-by: Eric Dumazet Cc: Andrew Lunn Acked-by: Jay Vosburgh Link: https://patch.msgid.link/20260113191201.3970737-1-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/bonding/bond_main.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 5abef8a3b7758..c66cb2d43dcf1 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -1953,6 +1953,12 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, */ if (!bond_has_slaves(bond)) { if (bond_dev->type != slave_dev->type) { + if (slave_dev->type != ARPHRD_ETHER && + BOND_MODE(bond) == BOND_MODE_8023AD) { + SLAVE_NL_ERR(bond_dev, slave_dev, extack, + "8023AD mode requires Ethernet devices"); + return -EINVAL; + } slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", bond_dev->type, slave_dev->type); -- 2.51.0