From patchwork Sat Aug 15 07:20:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Qiang X-Patchwork-Id: 1345252 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=163.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256 header.s=s110527 header.b=azujKpAG; 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 4BTNv741PWz9sR4 for ; Sun, 16 Aug 2020 01:06:59 +1000 (AEST) Received: from localhost ([::1]:43902 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k6xlp-0001wW-5l for incoming@patchwork.ozlabs.org; Sat, 15 Aug 2020 11:06:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48316) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k6xif-00070V-L2 for qemu-devel@nongnu.org; Sat, 15 Aug 2020 11:03:41 -0400 Received: from mail-m9763.mail.163.com ([123.126.97.63]:46538) by eggs.gnu.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1k6xiZ-0006bQ-Jm for qemu-devel@nongnu.org; Sat, 15 Aug 2020 11:03:39 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id; bh=GRipXL1wXwapZA2mgs copNepRvF0IcwJJiMPyjZeykA=; b=azujKpAGdyW1XusGyBUlmjlsJOX41GpsTh CC75MfhSPyS9asHJGeQy7lduiMoUzP/ga8CGmVJl97jlifd1OGuOakfa77y7uY97 /4gj4iSYi3dBHg2CO2r6Kuc9wsT3nMkcfuarJ9Wt0ZFsPcVtliDQ93qCZWcpx9L1 c1R/km92g= Received: from localhost.localdomain (unknown [115.204.244.155]) by smtp5 (Coremail) with SMTP id HdxpCgBn0O7WjDdfslvODQ--.349S4; Sat, 15 Aug 2020 15:20:56 +0800 (CST) From: Li Qiang To: jsnow@redhat.com, alxndr@bu.edu Subject: [PATCH] hw: ide: check the pointer before do dma memory unmap Date: Sat, 15 Aug 2020 00:20:52 -0700 Message-Id: <20200815072052.73228-1-liq3ea@163.com> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: HdxpCgBn0O7WjDdfslvODQ--.349S4 X-Coremail-Antispam: 1Uf129KBjvdXoW7XF4UGr4fuF17Zr1kZFy7Jrb_yoWfCrb_X3 yfX348Wa95Jayj9w13tw4rJ347t395Jr1kurySgry3uF17Jay3JFW8t3ZrWrW3tFZrtrW3 GF1F9FWrurWDKjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IU1fWFUUUUUU== X-Originating-IP: [115.204.244.155] X-CM-SenderInfo: 5oltjvrd6rljoofrz/1tbiFBmBbVaD6+TB1AAAsu Received-SPF: pass client-ip=123.126.97.63; envelope-from=liq3ea@163.com; helo=mail-m9763.mail.163.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/15 03:37:13 X-ACL-Warn: Detected OS = Linux 3.1-3.10 X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: Li Qiang , liq3ea@gmail.com, qemu-devel@nongnu.org, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" In 'map_page' we need to check the return value of 'dma_memory_map' to ensure the we actully maped something. Otherwise, we will hit an assert in 'address_space_unmap'. This is because we can't find the MR with the NULL buffer. This is the LP#1884693: -->https://bugs.launchpad.net/qemu/+bug/1884693 Reported-by: Alexander Bulekov Signed-off-by: Li Qiang Reviewed-by: Alexander Bulekov --- hw/ide/ahci.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c index 009120f88b..63e9fccdbe 100644 --- a/hw/ide/ahci.c +++ b/hw/ide/ahci.c @@ -250,6 +250,11 @@ static void map_page(AddressSpace *as, uint8_t **ptr, uint64_t addr, } *ptr = dma_memory_map(as, addr, &len, DMA_DIRECTION_FROM_DEVICE); + + if (!*ptr) { + return; + } + if (len < wanted) { dma_memory_unmap(as, *ptr, len, DMA_DIRECTION_FROM_DEVICE, len); *ptr = NULL;