From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.126.com (m16.mail.126.com [220.197.31.6]) (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 244F73F86FA; Mon, 6 Jul 2026 08:46:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.6 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783327595; cv=none; b=kTl5XFJrNe+t8xYBWKX/TAsS2ZLAuEjlmj+VlpAXEDXxrT54lF2LxcSMs2KrLfRyWhaNbj0cr9S1dyoooquieseGJ1x45me/L1jfHitnVLFqn/Z/PB1863bubLtL6+BYL+M6Kx9k0RbaaTMwlLjvH8snbX7RvghzWCcybMSkZ9o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783327595; c=relaxed/simple; bh=Aq7XpudnAcKaS81HjDJDNYPswQh+BUSNaYY8W66620A=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=U4u+4Do6/I1EJVnn+tUXEy4tpD1d6geRI06JLZ3h2hq/ETbxkKOxOtUouknq+n53uJs0GbLhNoueMbLIJ10bm8cv3DcAUNSIKsDvIw2KO7njhCCuQkjMd0n4Lc8V1QiFjTOzp/HawR978caHBW4DZ0BlkNN8TXQZKIrRrw/5t3o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=126.com; spf=pass smtp.mailfrom=126.com; dkim=pass (1024-bit key) header.d=126.com header.i=@126.com header.b=ng7yDoUh; arc=none smtp.client-ip=220.197.31.6 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=126.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=126.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=126.com header.i=@126.com header.b="ng7yDoUh" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=126.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=O/ yofhFvHkov23hY7UUkFz/6GuSRZ5PQqaEKBSq6uK8=; b=ng7yDoUh9xzk+cI9Db Jkm295TPDyA7NxLvxh82tF9kWXjAqMiuzTX4BHjfbT8nszLuvR1QC3M2EKVWboMc zMykFNW3zprDTKdjh6yIaEL7PPteRP26F7wwhizIHtw+Cl816Tx1oWKdxGQYB1yr LO9foGgCt/dWm87l40PqKZB+E= Received: from LAPTOP-M8806FGF.localdomain (unknown []) by gzga-smtp-mtada-g1-2 (Coremail) with SMTP id _____wD3958pa0tqWi0WCw--.19204S2; Mon, 06 Jul 2026 16:45:30 +0800 (CST) From: zhangzl2013@126.com To: Zhaolong Zhang , Jay Vosburgh Cc: Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hangbin Liu , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Qianheng Peng , Zhaolong Zhang Subject: [PATCH] bonding: fix devconf_all NULL dereference when IPv6 is disabled Date: Mon, 6 Jul 2026 16:45:30 +0800 Message-ID: <20260706084530.447402-1-zhangzl2013@126.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wD3958pa0tqWi0WCw--.19204S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7Aw4xAF1DZw4ktry5tFyrWFg_yoW8tF15pr Z3KrW5ur1ktr1UAF4UX3W093s5Za18XFZFkrWIkr95Zan5Ka1DAFy7Jr109F15trWrCFZI va1Uta90gwn5Jw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pE4SoPUUUUU= X-CM-SenderInfo: x2kd0wt2osiiat6rjloofrz/xtbBogpSImpLayog3wAA3H From: Zhaolong Zhang When booting with the 'ipv6.disable=1' parameter, the devconf_all is never initialized because inet6_init() exits before addrconf_init() is called which initializes it. bond_send_validate(), however, will still call bond_ns_send_all() even ipv6 is indeed disabled. It will lead to NULL derefence of net->ipv6.devconf_all in ip6_pol_route(). BUG: kernel NULL pointer dereference, address: 000000000000000c [...] Workqueue: bond0 bond_arp_monitor [bonding] RIP: 0010:ip6_pol_route+0x69/0x480 [...] Call Trace: ? srso_return_thunk+0x5/0x5f ? __pfx_ip6_pol_route_output+0x10/0x10 fib6_rule_lookup+0xfe/0x260 ? wakeup_preempt+0x8a/0x90 ? srso_return_thunk+0x5/0x5f ? srso_return_thunk+0x5/0x5f ? sched_balance_rq+0x369/0x810 ip6_route_output_flags+0xd7/0x170 bond_ns_send_all+0xde/0x280 [bonding] bond_ab_arp_probe+0x296/0x320 [bonding] ? srso_return_thunk+0x5/0x5f bond_activebackup_arp_mon+0xb4/0x2c0 [bonding] process_one_work+0x196/0x370 worker_thread+0x1af/0x320 ? srso_return_thunk+0x5/0x5f ? __pfx_worker_thread+0x10/0x10 kthread+0xe3/0x120 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x199/0x260 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 Fix this by adding ipv6_mod_enabled() condition check in the caller. Fixes: 4e24be018eb9 ("bonding: add new parameter ns_targets") Signed-off-by: Qianheng Peng Signed-off-by: Zhaolong Zhang --- drivers/net/bonding/bond_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index e044fc733b8c..522eab060f9e 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -3455,7 +3455,8 @@ static void bond_send_validate(struct bonding *bond, struct slave *slave) { bond_arp_send_all(bond, slave); #if IS_ENABLED(CONFIG_IPV6) - bond_ns_send_all(bond, slave); + if (likely(ipv6_mod_enabled())) + bond_ns_send_all(bond, slave); #endif } -- 2.52.0