From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:44040) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hG3nU-0000nJ-6d for qemu-devel@nongnu.org; Mon, 15 Apr 2019 11:45:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hG3nR-0007m6-Fa for qemu-devel@nongnu.org; Mon, 15 Apr 2019 11:45:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35046) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hG3nO-0007gJ-Lu for qemu-devel@nongnu.org; Mon, 15 Apr 2019 11:45:23 -0400 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Date: Mon, 15 Apr 2019 16:45:03 +0100 Message-Id: <20190415154503.6758-4-berrange@redhat.com> In-Reply-To: <20190415154503.6758-1-berrange@redhat.com> References: <20190415154503.6758-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PATCH 3/3] usb-mtp: fix alignment of access of ObjectInfo filename field List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Gerd Hoffmann , Bandan Das , Thomas Huth , Greg Kurz , Peter Maydell , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= The ObjectInfo struct's "filename" field is following a uint8_t field in a packed struct and thus has bad alignment for a 16-bit field. Switch the field to to uint8_t and use the helper function for accessing unaligned 16-bit data. Note that although the MTP spec specifies big endian, when transported over the USB protocol, data is little endian. Signed-off-by: Daniel P. Berrang=C3=A9 --- hw/usb/dev-mtp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c index 6b7d1296e4..963449ec7d 100644 --- a/hw/usb/dev-mtp.c +++ b/hw/usb/dev-mtp.c @@ -226,7 +226,7 @@ typedef struct { uint32_t assoc_desc; uint32_t seq_no; /*unused*/ uint8_t length; /*part of filename field*/ - uint16_t filename[0]; + uint8_t filename[0]; /* UTF-16 encoded */ char date_created[0]; /*unused*/ char date_modified[0]; /*unused*/ char keywords[0]; /*unused*/ @@ -1551,7 +1551,7 @@ static void usb_mtp_cancel_packet(USBDevice *dev, U= SBPacket *p) fprintf(stderr, "%s\n", __func__); } =20 -static char *utf16_to_str(uint8_t len, uint16_t *arr) +static char *utf16_to_str(uint8_t len, uint8_t *str16) { wchar_t *wstr =3D g_new0(wchar_t, len + 1); int count, dlen; @@ -1559,7 +1559,7 @@ static char *utf16_to_str(uint8_t len, uint16_t *ar= r) =20 for (count =3D 0; count < len; count++) { /* FIXME: not working for surrogate pairs */ - wstr[count] =3D (wchar_t)arr[count]; + wstr[count] =3D lduw_le_p(str16 + (count * 2)); } wstr[count] =3D 0; =20 --=20 2.20.1 From mboxrd@z Thu Jan 1 00:00:00 1970 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=-6.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS 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 C3045C10F0E for ; Mon, 15 Apr 2019 15:47:29 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 987E420880 for ; Mon, 15 Apr 2019 15:47:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 987E420880 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:51993 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hG3pQ-0001xP-SU for qemu-devel@archiver.kernel.org; Mon, 15 Apr 2019 11:47:28 -0400 Received: from eggs.gnu.org ([209.51.188.92]:44040) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hG3nU-0000nJ-6d for qemu-devel@nongnu.org; Mon, 15 Apr 2019 11:45:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hG3nR-0007m6-Fa for qemu-devel@nongnu.org; Mon, 15 Apr 2019 11:45:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35046) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hG3nO-0007gJ-Lu for qemu-devel@nongnu.org; Mon, 15 Apr 2019 11:45:23 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7985E3002F52; Mon, 15 Apr 2019 15:45:18 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.42.22.189]) by smtp.corp.redhat.com (Postfix) with ESMTP id B75D9608C1; Mon, 15 Apr 2019 15:45:16 +0000 (UTC) From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Date: Mon, 15 Apr 2019 16:45:03 +0100 Message-Id: <20190415154503.6758-4-berrange@redhat.com> In-Reply-To: <20190415154503.6758-1-berrange@redhat.com> References: <20190415154503.6758-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Mon, 15 Apr 2019 15:45:18 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 3/3] usb-mtp: fix alignment of access of ObjectInfo filename field X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Thomas Huth , Greg Kurz , Bandan Das , Gerd Hoffmann Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Message-ID: <20190415154503.vRByk2j7_dFAH63lFAUshdSUtpqqxZOsi6hUTA-EUjs@z> The ObjectInfo struct's "filename" field is following a uint8_t field in a packed struct and thus has bad alignment for a 16-bit field. Switch the field to to uint8_t and use the helper function for accessing unaligned 16-bit data. Note that although the MTP spec specifies big endian, when transported over the USB protocol, data is little endian. Signed-off-by: Daniel P. Berrang=C3=A9 --- hw/usb/dev-mtp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c index 6b7d1296e4..963449ec7d 100644 --- a/hw/usb/dev-mtp.c +++ b/hw/usb/dev-mtp.c @@ -226,7 +226,7 @@ typedef struct { uint32_t assoc_desc; uint32_t seq_no; /*unused*/ uint8_t length; /*part of filename field*/ - uint16_t filename[0]; + uint8_t filename[0]; /* UTF-16 encoded */ char date_created[0]; /*unused*/ char date_modified[0]; /*unused*/ char keywords[0]; /*unused*/ @@ -1551,7 +1551,7 @@ static void usb_mtp_cancel_packet(USBDevice *dev, U= SBPacket *p) fprintf(stderr, "%s\n", __func__); } =20 -static char *utf16_to_str(uint8_t len, uint16_t *arr) +static char *utf16_to_str(uint8_t len, uint8_t *str16) { wchar_t *wstr =3D g_new0(wchar_t, len + 1); int count, dlen; @@ -1559,7 +1559,7 @@ static char *utf16_to_str(uint8_t len, uint16_t *ar= r) =20 for (count =3D 0; count < len; count++) { /* FIXME: not working for surrogate pairs */ - wstr[count] =3D (wchar_t)arr[count]; + wstr[count] =3D lduw_le_p(str16 + (count * 2)); } wstr[count] =3D 0; =20 --=20 2.20.1