From patchwork Tue Mar 31 13:21:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 1264767 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=XK4II3Km; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 48s9LB53Hgz9sSt for ; Wed, 1 Apr 2020 00:34:58 +1100 (AEDT) Received: from localhost ([::1]:38166 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jJH2e-0003Af-FW for incoming@patchwork.ozlabs.org; Tue, 31 Mar 2020 09:34:56 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42111) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jJGqZ-0000hD-6Y for qemu-devel@nongnu.org; Tue, 31 Mar 2020 09:22:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jJGqY-0005yG-47 for qemu-devel@nongnu.org; Tue, 31 Mar 2020 09:22:27 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:23412 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jJGqX-0005xU-WC for qemu-devel@nongnu.org; Tue, 31 Mar 2020 09:22:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585660945; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=e2MtJXqXrK00L/Pg7ncr4ONHm/ufHOeDphL4A31MD7k=; b=XK4II3KmupQ9QldskIz3TequTmVzdJELICFdFO0eZlP/F98KehM4qA+SBoVrT84VPoJ5o6 LtL8l/JLJOvsja9xUPfRd4zxUgS3tVTeR9MFNyA2JIKuJYiUJ8DC1rajDD8f0ZlVGpg7Qk V7UV4ACuoXbYTCUgqpfeAoY6Sp5HYlg= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-135-8kQxrIl1O6CN6riw5Hu-sg-1; Tue, 31 Mar 2020 09:22:20 -0400 X-MC-Unique: 8kQxrIl1O6CN6riw5Hu-sg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3FD45107B267; Tue, 31 Mar 2020 13:22:19 +0000 (UTC) Received: from jason-ThinkPad-T430s.redhat.com (ovpn-12-118.pek2.redhat.com [10.72.12.118]) by smtp.corp.redhat.com (Postfix) with ESMTP id D72801001B28; Tue, 31 Mar 2020 13:22:17 +0000 (UTC) From: Jason Wang To: qemu-devel@nongnu.org, peter.maydell@linaro.org Subject: [PULL V2 13/14] hw/net/allwinner-sun8i-emac.c: Fix REG_ADDR_HIGH/LOW reads Date: Tue, 31 Mar 2020 21:21:38 +0800 Message-Id: <1585660899-11228-14-git-send-email-jasowang@redhat.com> In-Reply-To: <1585660899-11228-1-git-send-email-jasowang@redhat.com> References: <1585660899-11228-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason Wang Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Peter Maydell Coverity points out (CID 1421926) that the read code for REG_ADDR_HIGH reads off the end of the buffer, because it does a 32-bit read from byte 4 of a 6-byte buffer. The code also has an endianness issue for both REG_ADDR_HIGH and REG_ADDR_LOW, because it will do the wrong thing on a big-endian host. Rewrite the read code to use ldl_le_p() and lduw_le_p() to fix this; the write code is not incorrect, but for consistency we make it use stl_le_p() and stw_le_p(). Reviewed-by: Richard Henderson Tested-by: Niek Linnenbank Reviewed-by: Niek Linnenbank Signed-off-by: Peter Maydell Signed-off-by: Jason Wang --- hw/net/allwinner-sun8i-emac.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/hw/net/allwinner-sun8i-emac.c b/hw/net/allwinner-sun8i-emac.c index 033eaa8..28637ff 100644 --- a/hw/net/allwinner-sun8i-emac.c +++ b/hw/net/allwinner-sun8i-emac.c @@ -611,10 +611,10 @@ static uint64_t allwinner_sun8i_emac_read(void *opaque, hwaddr offset, value = s->mii_data; break; case REG_ADDR_HIGH: /* MAC Address High */ - value = *(((uint32_t *) (s->conf.macaddr.a)) + 1); + value = lduw_le_p(s->conf.macaddr.a + 4); break; case REG_ADDR_LOW: /* MAC Address Low */ - value = *(uint32_t *) (s->conf.macaddr.a); + value = ldl_le_p(s->conf.macaddr.a); break; case REG_TX_DMA_STA: /* Transmit DMA Status */ break; @@ -728,14 +728,10 @@ static void allwinner_sun8i_emac_write(void *opaque, hwaddr offset, s->mii_data = value; break; case REG_ADDR_HIGH: /* MAC Address High */ - s->conf.macaddr.a[4] = (value & 0xff); - s->conf.macaddr.a[5] = (value & 0xff00) >> 8; + stw_le_p(s->conf.macaddr.a + 4, value); break; case REG_ADDR_LOW: /* MAC Address Low */ - s->conf.macaddr.a[0] = (value & 0xff); - s->conf.macaddr.a[1] = (value & 0xff00) >> 8; - s->conf.macaddr.a[2] = (value & 0xff0000) >> 16; - s->conf.macaddr.a[3] = (value & 0xff000000) >> 24; + stl_le_p(s->conf.macaddr.a, value); break; case REG_TX_DMA_STA: /* Transmit DMA Status */ case REG_TX_CUR_DESC: /* Transmit Current Descriptor */