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 44DD13C009F; Thu, 15 Jan 2026 17:53:08 +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=1768499588; cv=none; b=L+nPV4/1hsIxL2F/UfoGRxap37cMuTMmE7mLF2f9oFhnFg7BDQKPoVPhj2yUwzP9EihxsrGEHkSzb7x9dR30M35GnQSBqAnh/pCjDK37O+FnutIi3tBGYj6LTAr9b9wgyJv9v0/qhYLM4+zINVXCM2F5epK1ulHNBqgt6FvsfY4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768499588; c=relaxed/simple; bh=FaMmNRqXVtrGY42o4C+6BZEiF//wPj7Gt93xfsEexIc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bHWZqVYH/riyxKkQOcAKXM6lbwOSTkZlzeWZYsynD5I/7Rpp2ruYU/fBR4RXW5jmrrbw+/Iq36WWph40ZEyTg6E/g3VasC1Rji8ezawUeqkOwhifDEyq8hdcoh7IMv4kCLM/RbBwOxkdEcYT5R9binbxSQgD62ny8NPU2yhcp4Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Z4e8v0hn; 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="Z4e8v0hn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 85A29C116D0; Thu, 15 Jan 2026 17:53:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768499587; bh=FaMmNRqXVtrGY42o4C+6BZEiF//wPj7Gt93xfsEexIc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z4e8v0hn+4HPo/TqkS9rXB07yWBfqjx9O6i6/FBI1QXkQWTRVUDwemFNsa4rDWZ8C c9egD39F81+8tt8sO+hAnDv9TmUsa46SYZyQFKXPwRl47R+8V5hsSwnG2l2kTlC3gj wChIBaPTjZA8ot5aOkia/PzFMuiXC6kSp8kh49Sc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+422806e5f4cce722a71f@syzkaller.appspotmail.com, Jiri Pirko , Simon Horman , Paolo Abeni , Sasha Levin Subject: [PATCH 5.10 280/451] team: fix check for port enabled in team_queue_override_port_prio_changed() Date: Thu, 15 Jan 2026 17:48:01 +0100 Message-ID: <20260115164241.011726720@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115164230.864985076@linuxfoundation.org> References: <20260115164230.864985076@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 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jiri Pirko [ Upstream commit 932ac51d9953eaf77a1252f79b656d4ca86163c6 ] There has been a syzkaller bug reported recently with the following trace: list_del corruption, ffff888058bea080->prev is LIST_POISON2 (dead000000000122) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:59! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 3 UID: 0 PID: 21246 Comm: syz.0.2928 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:__list_del_entry_valid_or_report+0x13e/0x200 lib/list_debug.c:59 Code: 48 c7 c7 e0 71 f0 8b e8 30 08 ef fc 90 0f 0b 48 89 ef e8 a5 02 55 fd 48 89 ea 48 89 de 48 c7 c7 40 72 f0 8b e8 13 08 ef fc 90 <0f> 0b 48 89 ef e8 88 02 55 fd 48 89 ea 48 b8 00 00 00 00 00 fc ff RSP: 0018:ffffc9000d49f370 EFLAGS: 00010286 RAX: 000000000000004e RBX: ffff888058bea080 RCX: ffffc9002817d000 RDX: 0000000000000000 RSI: ffffffff819becc6 RDI: 0000000000000005 RBP: dead000000000122 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000001 R12: ffff888039e9c230 R13: ffff888058bea088 R14: ffff888058bea080 R15: ffff888055461480 FS: 00007fbbcfe6f6c0(0000) GS:ffff8880d6d0a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3afcb0 CR3: 00000000382c7000 CR4: 0000000000352ef0 Call Trace: __list_del_entry_valid include/linux/list.h:132 [inline] __list_del_entry include/linux/list.h:223 [inline] list_del_rcu include/linux/rculist.h:178 [inline] __team_queue_override_port_del drivers/net/team/team_core.c:826 [inline] __team_queue_override_port_del drivers/net/team/team_core.c:821 [inline] team_queue_override_port_prio_changed drivers/net/team/team_core.c:883 [inline] team_priority_option_set+0x171/0x2f0 drivers/net/team/team_core.c:1534 team_option_set drivers/net/team/team_core.c:376 [inline] team_nl_options_set_doit+0x8ae/0xe60 drivers/net/team/team_core.c:2653 genl_family_rcv_msg_doit+0x209/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2630 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2684 __sys_sendmsg+0x16d/0x220 net/socket.c:2716 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The problem is in this flow: 1) Port is enabled, queue_id != 0, in qom_list 2) Port gets disabled -> team_port_disable() -> team_queue_override_port_del() -> del (removed from list) 3) Port is disabled, queue_id != 0, not in any list 4) Priority changes -> team_queue_override_port_prio_changed() -> checks: port disabled && queue_id != 0 -> calls del - hits the BUG as it is removed already To fix this, change the check in team_queue_override_port_prio_changed() so it returns early if port is not enabled. Reported-by: syzbot+422806e5f4cce722a71f@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=422806e5f4cce722a71f Fixes: 6c31ff366c11 ("team: remove synchronize_rcu() called during queue override change") Signed-off-by: Jiri Pirko Reviewed-by: Simon Horman Link: https://patch.msgid.link/20251212102953.167287-1-jiri@resnulli.us Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/team/team.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c index c05a60f23677..03cc3da8c3c1 100644 --- a/drivers/net/team/team.c +++ b/drivers/net/team/team.c @@ -872,7 +872,7 @@ static void __team_queue_override_enabled_check(struct team *team) static void team_queue_override_port_prio_changed(struct team *team, struct team_port *port) { - if (!port->queue_id || team_port_enabled(port)) + if (!port->queue_id || !team_port_enabled(port)) return; __team_queue_override_port_del(team, port); __team_queue_override_port_add(team, port); -- 2.51.0