From patchwork Tue Mar 7 16:50:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 13164269 X-Patchwork-Delegate: kuba@kernel.org 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 9A716C6FD1E for ; Tue, 7 Mar 2023 17:25:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231361AbjCGRZK (ORCPT ); Tue, 7 Mar 2023 12:25:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231499AbjCGRYj (ORCPT ); Tue, 7 Mar 2023 12:24:39 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C79BE8B059; Tue, 7 Mar 2023 09:19:56 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 6ACF1B819AC; Tue, 7 Mar 2023 17:19:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56C83C433D2; Tue, 7 Mar 2023 17:19:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678209595; bh=JMLUAfksZAYlWBKrT4AhUj1YntkhyAno433wMClUZe4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UMz7GIWF5MMIgYvrl+4yaTQrEJnBTWSmdFlqwONY2b96BbkSVt3LyJws2pcDljqcs xBg/fQgfdZmcCZjWtwX5aZ8yyzJ5PuBFbN2UTxQKOOy65QEJ+W/uSRrOBalYMTv03W RrACKr6GCw61OEbb/kuqYbtJffHbbd32sfbFJP+Y= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Luiz Augusto von Dentz , Marcel Holtmann , Johan Hedberg , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, Kees Cook , Simon Horman , Sasha Levin Subject: [PATCH 6.2 0270/1001] Bluetooth: hci_conn: Refactor hci_bind_bis() since it always succeeds Date: Tue, 7 Mar 2023 17:50:42 +0100 Message-Id: <20230307170033.423462436@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307170022.094103862@linuxfoundation.org> References: <20230307170022.094103862@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Kees Cook [ Upstream commit a00a29b0eeea6caaaf9edc3dd284f81b072ee343 ] The compiler thinks "conn" might be NULL after a call to hci_bind_bis(), which cannot happen. Avoid any confusion by just making it not return a value since it cannot fail. Fixes the warnings seen with GCC 13: In function 'arch_atomic_dec_and_test', inlined from 'atomic_dec_and_test' at ../include/linux/atomic/atomic-instrumented.h:576:9, inlined from 'hci_conn_drop' at ../include/net/bluetooth/hci_core.h:1391:6, inlined from 'hci_connect_bis' at ../net/bluetooth/hci_conn.c:2124:3: ../arch/x86/include/asm/rmwcc.h:37:9: warning: array subscript 0 is outside array bounds of 'atomic_t[0]' [-Warray-bounds=] 37 | asm volatile (fullop CC_SET(cc) \ | ^~~ ... In function 'hci_connect_bis': cc1: note: source object is likely at address zero Fixes: eca0ae4aea66 ("Bluetooth: Add initial implementation of BIS connections") Cc: Luiz Augusto von Dentz Cc: Marcel Holtmann Cc: Johan Hedberg Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: linux-bluetooth@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Simon Horman Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Sasha Levin --- net/bluetooth/hci_conn.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index acf563fbdfd95..61a34801e61ea 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -1981,16 +1981,14 @@ static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn, qos->latency = conn->le_conn_latency; } -static struct hci_conn *hci_bind_bis(struct hci_conn *conn, - struct bt_iso_qos *qos) +static void hci_bind_bis(struct hci_conn *conn, + struct bt_iso_qos *qos) { /* Update LINK PHYs according to QoS preference */ conn->le_tx_phy = qos->out.phy; conn->le_tx_phy = qos->out.phy; conn->iso_qos = *qos; conn->state = BT_BOUND; - - return conn; } static int create_big_sync(struct hci_dev *hdev, void *data) @@ -2119,11 +2117,7 @@ struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst, if (IS_ERR(conn)) return conn; - conn = hci_bind_bis(conn, qos); - if (!conn) { - hci_conn_drop(conn); - return ERR_PTR(-ENOMEM); - } + hci_bind_bis(conn, qos); /* Add Basic Announcement into Peridic Adv Data if BASE is set */ if (base_len && base) {