From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 92F4A35F61A; Thu, 2 Jul 2026 16:42:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783010567; cv=none; b=WSE8+pO+Iq3IDWus2MrB9lIoLplbQXyMy2gZv5sWsztgZy1A97ntcRZEU2KQ+MPjnd7fz603OoWA32cPwM/xHt5CB+dXbFNaKdxYZLgR7XBKQA94cb+fxRK7XpcVDBSIAaC1NpzJQuD8joC1sQdxIA0lByeMbnlCPi46D8y9jp4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783010567; c=relaxed/simple; bh=GnS5Y5/yYD+g9vZgITH1WjsCWGsNrdKghStsA07WGEY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DCFwfWBetYGp51YueSr9nuGFF2YEIKcGcnr/8VH9lxJE4gJr5QU52JQORdSrgVx4HLNqvob09uLRThKSeayVRBmylenXSqAsoETobNLlEyrX+Jsy8itwvtVzp0EUid/M9AaWruHvtSCf2JcO/iVM1FuQH4692usAxy4uKmPX71Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VLOWnodE; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="VLOWnodE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 05F2E1F000E9; Thu, 2 Jul 2026 16:42:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1783010566; bh=Zn1mmxy+BlTjSqV9eBcrkuS1OLkY57DX7FMCqx3cMNE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=VLOWnodEEpkcQPJMWxwWLmL1otSRa8gE+El0TwHW0pbh0xqIH9iotR8v7Ltgqc45j bpPXTzJ2ZoKwLaUjZcxDbsmXvOUyYh0abDlDbBrWFciFPiur4jtJvRClO0h/IkGWs3 K8X29VZkY+Z1jDqOf5NbK8jJ2G1AZzMVV4Ijk3CI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable@kernel.org, Sven Eckelmann , Sasha Levin Subject: [PATCH 6.12 114/204] batman-adv: v: prevent OGM aggregation on disabled hardif Date: Thu, 2 Jul 2026 18:19:31 +0200 Message-ID: <20260702155121.049126205@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260702155118.667618796@linuxfoundation.org> References: <20260702155118.667618796@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sven Eckelmann commit d11c00b95b2a3b3934007fc003dccc6fdcc061ad upstream. When an interface gets disabled, the worker is correctly disabled by batadv_hardif_disable_interface() -> ... -> batadv_v_ogm_iface_disable(). In this process, the skb aggr_list is also freed. But batadv_v_ogm_send_meshif() can still queue new skbs (via batadv_v_ogm_queue_on_if()) to the aggr_list. This will only stop after all cores can no longer find the RCU protected list of hard interfaces. These queued skbs will never be freed or consumed by batadv_v_ogm_aggr_work. The batadv_v_ogm_iface_disable() function must block batadv_v_ogm_queue_on_if() to avoid leak of skbs. Cc: stable@kernel.org Fixes: f89255a02f1d ("batman-adv: BATMAN_V: introduce per hard-iface OGMv2 queues") [ Context ] Signed-off-by: Sven Eckelmann Signed-off-by: Sasha Levin --- net/batman-adv/bat_v.c | 1 + net/batman-adv/bat_v_ogm.c | 12 ++++++++++++ net/batman-adv/types.h | 6 ++++++ 3 files changed, 19 insertions(+) diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c index d35479c465e2c4..e13b39121f2db8 100644 --- a/net/batman-adv/bat_v.c +++ b/net/batman-adv/bat_v.c @@ -819,6 +819,7 @@ void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface) hard_iface->bat_v.aggr_len = 0; skb_queue_head_init(&hard_iface->bat_v.aggr_list); + hard_iface->bat_v.aggr_list_enabled = false; INIT_DELAYED_WORK(&hard_iface->bat_v.aggr_wq, batadv_v_ogm_aggr_work); } diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c index 8cfc3944dcfd52..48a67705eba85c 100644 --- a/net/batman-adv/bat_v_ogm.c +++ b/net/batman-adv/bat_v_ogm.c @@ -254,11 +254,18 @@ static void batadv_v_ogm_queue_on_if(struct batadv_priv *bat_priv, } spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); + if (!hard_iface->bat_v.aggr_list_enabled) { + kfree_skb(skb); + goto unlock; + } + if (!batadv_v_ogm_queue_left(skb, hard_iface)) batadv_v_ogm_aggr_send(bat_priv, hard_iface); hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb); __skb_queue_tail(&hard_iface->bat_v.aggr_list, skb); + +unlock: spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); } @@ -421,6 +428,10 @@ int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); + hard_iface->bat_v.aggr_list_enabled = true; + spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); + batadv_v_ogm_start_queue_timer(hard_iface); batadv_v_ogm_start_timer(bat_priv); @@ -436,6 +447,7 @@ void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface) cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq); spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); + hard_iface->bat_v.aggr_list_enabled = false; batadv_v_ogm_aggr_list_free(hard_iface); spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); } diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index f703d266780d74..3b2a170b1cf18b 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -130,6 +130,12 @@ struct batadv_hard_iface_bat_v { /** @aggr_list: queue for to be aggregated OGM packets */ struct sk_buff_head aggr_list; + /** + * @aggr_list_enabled: aggr_list is active and new skbs can be + * enqueued. Protected by aggr_list.lock after initialization + */ + bool aggr_list_enabled:1; + /** @aggr_len: size of the OGM aggregate (excluding ethernet header) */ unsigned int aggr_len; -- 2.53.0