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 CB0C8349CDC; Thu, 2 Jul 2026 16:27:33 +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=1783009658; cv=none; b=LSjgpQjKZ2tUW2m3MEeTU+BcC2M54UG5JKz4xwEo9J1Nli1EQlEwaayg0/EaYWaXvJzsH7Tj2aY3H4IWEy6TFx4/5cJBLcbgwxUIqLxtrGjSuLHyE4X+HyquIpZknmy1qgZOk8dkQ21ICwgTIpUKh2iXQGmq4aUQx9s/Xd8CLJc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783009658; c=relaxed/simple; bh=cJsXWUmETnAg6bu6kdRiq2KaUd7Lq2qXanXg490afX0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=o3Lcgb0R8ypdRF43td+WoHyRc57fAR1uPhGqEDXCL2KBkfsINyehIuTdCNbDrLfPb1EbhEQphXousQ2J7lqphKXW8Fe8S+ixXA09G5oru9dYW3q+1oaAnOQWcmp0qQEubgYg6ZtVFui1ZxcPCehqRaoCIe4UbZU7H10D6YNTkgI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=O5RErBQk; 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="O5RErBQk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C4BD1F000E9; Thu, 2 Jul 2026 16:27:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1783009652; bh=o3QUJCU8P61mcBX2KIVqIzWwuxi4s1tUb76ls1nnaXA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=O5RErBQkeU0mmESiHXbH7v1LyBgFN08p4WqB/iVNZdRZ7vtQint/H2ImsI2wL6f1h FDjiJoOM6a64KJaEMwnotZpUtFun1VrdYpm2YZ9MzmRBtkd4IXws3H+gQjmjkSjJxN 2FxUPkKsFljJUNA7toJfZn+50Besv0pRF/bbA2Rg= 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 5.15 35/95] batman-adv: tp_meter: add only finished tp_vars to lists Date: Thu, 2 Jul 2026 18:19:38 +0200 Message-ID: <20260702155109.946421107@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260702155109.196223802@linuxfoundation.org> References: <20260702155109.196223802@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sven Eckelmann commit 15ccbf685222274f5add1387af58c2a41a95f81e upstream. When the receiver variables (aka "session") are initialized, then they are added to the list of sessions before the timer is set up. A RCU protected reader could therefore find the entry and run mod_setup before batadv_tp_init_recv() finished the timer initialization. The same is true for batadv_tp_start(), which must first initialize the finish_work and the test_length to avoid a similar problem. Cc: stable@kernel.org Fixes: 33a3bb4a3345 ("batman-adv: throughput meter implementation") Signed-off-by: Sven Eckelmann Signed-off-by: Sasha Levin --- net/batman-adv/tp_meter.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/net/batman-adv/tp_meter.c b/net/batman-adv/tp_meter.c index 7385cd02abf9f0..257f8d042d158e 100644 --- a/net/batman-adv/tp_meter.c +++ b/net/batman-adv/tp_meter.c @@ -1096,21 +1096,21 @@ void batadv_tp_start(struct batadv_priv *bat_priv, const u8 *dst, tp_vars->prerandom_offset = 0; spin_lock_init(&tp_vars->prerandom_lock); - kref_get(&tp_vars->refcount); - hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list); - spin_unlock_bh(&bat_priv->tp_list_lock); - tp_vars->test_length = test_length; if (!tp_vars->test_length) tp_vars->test_length = BATADV_TP_DEF_TEST_LENGTH; + /* init work item for finished tp tests */ + INIT_DELAYED_WORK(&tp_vars->finish_work, batadv_tp_sender_finish); + + kref_get(&tp_vars->refcount); + hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list); + spin_unlock_bh(&bat_priv->tp_list_lock); + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, "Meter: starting throughput meter towards %pM (length=%ums)\n", dst, test_length); - /* init work item for finished tp tests */ - INIT_DELAYED_WORK(&tp_vars->finish_work, batadv_tp_sender_finish); - /* start tp kthread. This way the write() call issued from userspace can * happily return and avoid to block */ @@ -1430,10 +1430,10 @@ batadv_tp_init_recv(struct batadv_priv *bat_priv, INIT_LIST_HEAD(&tp_vars->unacked_list); kref_get(&tp_vars->refcount); - hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list); + timer_setup(&tp_vars->timer, batadv_tp_receiver_shutdown, 0); kref_get(&tp_vars->refcount); - timer_setup(&tp_vars->timer, batadv_tp_receiver_shutdown, 0); + hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list); batadv_tp_reset_receiver_timer(tp_vars); -- 2.53.0