From patchwork Mon Jan 11 13:02:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 12010589 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1952BC433E0 for ; Mon, 11 Jan 2021 13:04:03 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C863A22527 for ; Mon, 11 Jan 2021 13:04:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C863A22527 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=glider.be Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 1C96616B6; Mon, 11 Jan 2021 14:03:08 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 1C96616B6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1610370238; bh=Q7/NT5QACk5oSg2TvTmZeJJFOtmc0RYEEhI3LMHfiZM=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=AS3b7Ci3vWC/CfK+DFmnU923c059j//bQEVyY/O16bdk6ay6xnVT0HNxz3dVQ14qS 632CKQrC4bFyVn6MFCkQjX04F2sMIJnmYPe8SYRbZJZpaTRrutwJtsZ0lcjDjPCILz /M/EddrqqOv0OdEy5ASwT3LQ4cUvu3QIUGp9yiCA= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id C179CF8016C; Mon, 11 Jan 2021 14:03:06 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 9BCECF8026B; Mon, 11 Jan 2021 14:03:04 +0100 (CET) Received: from michel.telenet-ops.be (michel.telenet-ops.be [IPv6:2a02:1800:110:4::f00:18]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 94520F8016C for ; Mon, 11 Jan 2021 14:02:55 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 94520F8016C Received: from ramsan.of.borg ([84.195.186.194]) by michel.telenet-ops.be with bizsmtp id FR2u2400j4C55Sk06R2uHp; Mon, 11 Jan 2021 14:02:55 +0100 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1kywqU-002pvS-A9; Mon, 11 Jan 2021 14:02:54 +0100 Received: from geert by rox.of.borg with local (Exim 4.93) (envelope-from ) id 1kywqT-001W0u-RF; Mon, 11 Jan 2021 14:02:53 +0100 From: Geert Uytterhoeven To: Clemens Ladisch , Takashi Sakamoto , Jaroslav Kysela , Takashi Iwai Subject: [PATCH/RFC 2/2] ALSA: firewire-tascam: Fix integer overflow in midi_port_work() Date: Mon, 11 Jan 2021 14:02:51 +0100 Message-Id: <20210111130251.361335-3-geert+renesas@glider.be> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210111130251.361335-1-geert+renesas@glider.be> References: <20210111130251.361335-1-geert+renesas@glider.be> MIME-Version: 1.0 Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" As snd_fw_async_midi_port.consume_bytes is unsigned int, and NSEC_PER_SEC is 1000000000L, the second multiplication in port->consume_bytes * 8 * NSEC_PER_SEC / 31250 always overflows on 32-bit platforms, truncating the result. Fix this by precalculating "NSEC_PER_SEC / 31250", which is an integer constant. Note that this assumes port->consume_bytes <= 16777. Fixes: 531f471834227d03 ("ALSA: firewire-lib/firewire-tascam: localize async midi port") Signed-off-by: Geert Uytterhoeven Reviewed-by: Takashi Sakamoto --- Compile-tested only. I don't know the maximum transfer length of MIDI, but given it's an old standard, I guess it's rather small. If it is larger than 16777, the constant "8" should be replaced by "8ULL", to force 64-bit arithmetic. --- sound/firewire/tascam/tascam-transaction.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/firewire/tascam/tascam-transaction.c b/sound/firewire/tascam/tascam-transaction.c index 90288b4b46379526..a073cece4a7d5e3a 100644 --- a/sound/firewire/tascam/tascam-transaction.c +++ b/sound/firewire/tascam/tascam-transaction.c @@ -209,7 +209,7 @@ static void midi_port_work(struct work_struct *work) /* Set interval to next transaction. */ port->next_ktime = ktime_add_ns(ktime_get(), - port->consume_bytes * 8 * NSEC_PER_SEC / 31250); + port->consume_bytes * 8 * (NSEC_PER_SEC / 31250)); /* Start this transaction. */ port->idling = false;