From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.126.com (m16.mail.126.com [117.135.210.8]) (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 DFF3C18FDDE; Tue, 7 Jul 2026 01:07:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.8 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783386434; cv=none; b=rKPn1iJddw0mydF2nCfAGDHJH/BAehtcgIEVJ0xFZOcSLvkCOvoyj+FRqYdw5BmfwOaA30gJT4KWbMyFkSXOgowD5P9LoukASZlreuHjmcRhuQuHJMzH1mRqyUBdZal37wliP/kDPgyzg02kgQIokVoAy7rY5K57jC/sSfYzC+w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783386434; c=relaxed/simple; bh=Aq7XpudnAcKaS81HjDJDNYPswQh+BUSNaYY8W66620A=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=aMTs5A2UfOJPoLhcLhDFxWbMgAtwOCPoyTHjqdJd4lmHpWCMXZd3tnGKz6wtajx61iiUsJZH/9xBJR8fo4K2MtU/YvUA46YCBa3vUE5Z7aJiPJ4qQKYwYf+gNemTgNVTRMuWUpbPmoxBkX/m2lUE224txmaFWAuz6mE+Flmc9hQ= 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=cuRt6UfV; arc=none smtp.client-ip=117.135.210.8 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="cuRt6UfV" 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=cuRt6UfVqt+OOV63XA Qq7Yvn7fnto+BEbMIL+RZG0TK+eMzYryk/MAIzC1/3ps1j8+iWCSWFSpHqwLbJLp NQmr2TF+dEhQBtpeTnDENIUCBc4iXquKw/yyGceQ/lcjz0Eh5wgoeaZqHYyiFfrd T93a23CIVB7axoJYwE8lTuAL0= Received: from LAPTOP-M8806FGF.localdomain (unknown []) by gzga-smtp-mtada-g0-0 (Coremail) with SMTP id _____wD3J84NUUxqULAkDA--.47340S2; Tue, 07 Jul 2026 09:06:22 +0800 (CST) From: zhangzl2013@126.com To: Zhaolong Zhang , Jay Vosburgh , Andrew Lunn , Jakub Kicinski Cc: "David S . Miller" , Eric Dumazet , Paolo Abeni , Hangbin Liu , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Qianheng Peng , Zhaolong Zhang Subject: [PATCH net] bonding: fix devconf_all NULL dereference when IPv6 is disabled Date: Tue, 7 Jul 2026 09:06:22 +0800 Message-ID: <20260707010622.487333-1-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:_____wD3J84NUUxqULAkDA--.47340S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7Aw4xAF1DZw4ktry5tFyrWFg_yoW8tF15pr Z3KrW5ur1ktr1UAF4UX3W093s5Za18XFZFkrWIkr95Zan5Ka1DAFy7Jr109F15trWrCFZI va1Uta90gwn5Jw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pEfHUPUUUUU= X-CM-SenderInfo: x2kd0wt2osiiat6rjloofrz/xtbBog4F1GpMUQ7iOwAA3d 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