From patchwork Wed Sep 13 19:38:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luiz Augusto von Dentz X-Patchwork-Id: 722702 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38212EE0207 for ; Wed, 13 Sep 2023 19:38:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232445AbjIMTir (ORCPT ); Wed, 13 Sep 2023 15:38:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230475AbjIMTiq (ORCPT ); Wed, 13 Sep 2023 15:38:46 -0400 Received: from mail-il1-x132.google.com (mail-il1-x132.google.com [IPv6:2607:f8b0:4864:20::132]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D946191 for ; Wed, 13 Sep 2023 12:38:42 -0700 (PDT) Received: by mail-il1-x132.google.com with SMTP id e9e14a558f8ab-34f27cf1786so621465ab.2 for ; Wed, 13 Sep 2023 12:38:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1694633921; x=1695238721; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:from:to:cc:subject:date:message-id:reply-to; bh=8eeca0hO0P95yMfRCzUieziGcJehEd+4vAsn+h19zJw=; b=AbqtkzAmQJyYjYWBqzz1Thb+/mQ2NNKx1vlx0OzLXWnrvTS3KAKtVuHta5HhTQMxHk CY0LxyoeTdmzgX4KmkOtaUQCBBDaFHAPtfWPb2NBV+ww+1uUcsGqr3xQUlRlxA72jO6H NELlBxk+HwqRqbm8qVlAulcipnHbgJIkarQl/mY6umGRc4EbKey3+UZXLZgJiewO1an7 sKM7zj9tXnCCvnEqHdzw0mDwRxA8pigP1OB+BdSP4f4JlCAcjj1qC+JuTLLsZec8eVNM HkTPS8Rfmv8HDb714wd7ECtiY5/upSBMQK6z790+o0+nyYxXcJiV3ddDjRAboxq2ZRYB rm0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694633921; x=1695238721; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=8eeca0hO0P95yMfRCzUieziGcJehEd+4vAsn+h19zJw=; b=WBCqbfvV8FyWkvjJQpnLsnXBVJ+3FCqIwFdQopbBoccmNNNi/Q5YxcMIjhY1B6D3vL w1NMjg45nkPo/liUfqF04RDL136eHE2p1+wt8tA5oK+Uu+IKOhTBr5jMZtWgFonoiDT8 Y1cAsgmcO0Z0/aZ5JXQ2mEBUs2OhgbofmPVFcrj6aTf8Oc21D+v47TZHSyov6vp/WZMH oLlyEIgbp1ghOHAHQmzb7yj/DMtNOLU/6FvExcFMoj3C7AO5UuXeLz71dXWH+9+FlpyH HfiHBFnl+vJz1xYw7phIpVKkPTE8b0GXS7muJdTOrGycld/Q/s1F9mQ3XsfkUjrDe/l4 sm9A== X-Gm-Message-State: AOJu0YwiK0u8WMKLJC+n0TgmkTOOEZCqXEMvzscU6KrWlBlhBvNml9ke VyYP2SEd3lcl68VOrRz4O1eBE9cUYDs= X-Google-Smtp-Source: AGHT+IGibpv46kBh3RNnyQEXDLES8l+BH08rDHtit0TJXNenfc3Mp72EJ24qPvpY8P++c7vf832Eaw== X-Received: by 2002:a05:6e02:12b2:b0:348:797d:a94e with SMTP id f18-20020a056e0212b200b00348797da94emr3368498ilr.2.1694633921485; Wed, 13 Sep 2023 12:38:41 -0700 (PDT) Received: from lvondent-mobl4.. (c-98-232-221-87.hsd1.or.comcast.net. [98.232.221.87]) by smtp.gmail.com with ESMTPSA id h20-20020a056e020d5400b00345d10ea524sm2174301ilj.65.2023.09.13.12.38.40 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Sep 2023 12:38:40 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH] Bluetooth: L2CAP: Fix leaking l2cap_conn objects Date: Wed, 13 Sep 2023 12:38:39 -0700 Message-ID: <20230913193839.3029428-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz l2cap_conn objects must be cleanup whenever its hci_chan is deleted by hci_chan_list_flush since it means the connection attempt is being aborted prematurely thus no calls to connect_cfm/disconnect_cfm would be generated causing the l2cap_conn object to leak. Fixes: 73d80deb7bdf ("Bluetooth: prioritizing data over HCI") Reported-by: Olivier L'Heureux Signed-off-by: Luiz Augusto von Dentz --- include/net/bluetooth/hci_core.h | 2 ++ net/bluetooth/hci_conn.c | 7 +++++++ net/bluetooth/l2cap_core.c | 29 ++++++++++++++++++++++++++--- 3 files changed, 35 insertions(+), 3 deletions(-) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index bbad301f5781..21459c38a074 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -795,6 +795,8 @@ struct hci_chan { unsigned int sent; __u8 state; bool amp; + + void (*cleanup)(struct hci_chan *chan); }; struct hci_conn_params { diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index e62a5f368a51..814d8f3b029e 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -2737,6 +2737,9 @@ void hci_chan_del(struct hci_chan *chan) struct hci_conn *conn = chan->conn; struct hci_dev *hdev = conn->hdev; + if (!conn) + return; + BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan); list_del_rcu(&chan->list); @@ -2746,6 +2749,10 @@ void hci_chan_del(struct hci_chan *chan) /* Prevent new hci_chan's to be created for this hci_conn */ set_bit(HCI_CONN_DROP, &conn->flags); + if (chan->cleanup) + chan->cleanup(chan); + + chan->conn = NULL; hci_conn_put(conn); skb_queue_purge(&chan->data_q); diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 17ca13e8c044..a791f28ccd6a 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -1896,6 +1896,8 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err) BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); + hcon->l2cap_data = NULL; + kfree_skb(conn->rx_skb); skb_queue_purge(&conn->pending_rx); @@ -1931,13 +1933,15 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err) mutex_unlock(&conn->chan_lock); - hci_chan_del(conn->hchan); + if (conn->hchan) { + conn->hchan->cleanup = NULL; + hci_chan_del(conn->hchan); + conn->hchan = NULL; + } if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) cancel_delayed_work_sync(&conn->info_timer); - hcon->l2cap_data = NULL; - conn->hchan = NULL; l2cap_conn_put(conn); } @@ -7830,6 +7834,24 @@ static void process_pending_rx(struct work_struct *work) l2cap_recv_frame(conn, skb); } +static void l2cap_conn_hchan_cleanup(struct hci_chan *hchan) +{ + struct hci_conn *hcon = hchan->conn; + struct l2cap_conn *conn; + + if (!hcon) + return; + + conn = hcon->l2cap_data; + if (!conn) + return; + + /* hci_chan_del has been called so we shouldn't call it gain. */ + conn->hchan = NULL; + + l2cap_conn_del(hcon, bt_to_errno(HCI_ERROR_LOCAL_HOST_TERM)); +} + static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) { struct l2cap_conn *conn = hcon->l2cap_data; @@ -7852,6 +7874,7 @@ static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) hcon->l2cap_data = conn; conn->hcon = hci_conn_get(hcon); conn->hchan = hchan; + hchan->cleanup = l2cap_conn_hchan_cleanup; BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);