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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,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 46994C432C3 for ; Mon, 25 Nov 2019 10:35:52 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (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 0EF942082F for ; Mon, 25 Nov 2019 10:35:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="dyy2ZVwk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0EF942082F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id ADF3487B2E; Mon, 25 Nov 2019 10:35:51 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bw8QP2IQa1hW; Mon, 25 Nov 2019 10:35:51 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id 0F04B87A9C; Mon, 25 Nov 2019 10:35:51 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id EC371C1DD7; Mon, 25 Nov 2019 10:35:50 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 42031C0878 for ; Mon, 25 Nov 2019 10:35:49 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 386B9204B0 for ; Mon, 25 Nov 2019 10:35:49 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id t8FjbuoGgGzs for ; Mon, 25 Nov 2019 10:35:48 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from us-smtp-delivery-1.mimecast.com (us-smtp-2.mimecast.com [207.211.31.81]) by silver.osuosl.org (Postfix) with ESMTPS id 3DDB6204A2 for ; Mon, 25 Nov 2019 10:35:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574678146; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=ZMYkA3jI8+ywNR+OhV3jpIlPger7eOA5dEPy09p1d6E=; b=dyy2ZVwk9P1P6CI6YlUeRdXMkmj6h6DHx9ZsORsqi1X17W72/3ZEjvkJOIvgx3m9ld2TXV Uvtq8M8mdf6s9NdiPIamRF7qrZUtQGpUBdMiDlZld3P9c/skUY258gtks+g2R5ODR2/shS +qQELQDJeZOF1C3S/b5fbyYkOe8Q2/o= 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-337-8pbgYF59MamGTDCxyCAzoQ-1; Mon, 25 Nov 2019 05:35:45 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 10B44107B765; Mon, 25 Nov 2019 10:35:44 +0000 (UTC) Received: from laptop.redhat.com (ovpn-116-37.ams2.redhat.com [10.36.116.37]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8C39319C69; Mon, 25 Nov 2019 10:35:39 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, joro@8bytes.org, hch@lst.de, cai@lca.pw, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH] iommu: fix KASAN use-after-free in iommu_insert_resv_region Date: Mon, 25 Nov 2019 11:35:35 +0100 Message-Id: <20191125103535.22782-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: 8pbgYF59MamGTDCxyCAzoQ-1 X-Mimecast-Spam-Score: 0 X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Store the new region type in a variable. In case the new region gets merged into another one, the new node is freed and nr shall not be used anymore. Fixes: 4dbd258ff63e ("iommu: Revisit iommu_insert_resv_region() implementation") Signed-off-by: Eric Auger Reported-by: Qian Cai CC: Stable #v5.3+ --- drivers/iommu/iommu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index d658c7c6a2ab..338769f96d17 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -293,6 +293,8 @@ int iommu_insert_resv_region(struct iommu_resv_region *new, struct list_head *regions) { struct iommu_resv_region *iter, *tmp, *nr, *top; + enum iommu_resv_type nr_type = new->type; + LIST_HEAD(stack); nr = iommu_alloc_resv_region(new->start, new->length, @@ -313,7 +315,7 @@ int iommu_insert_resv_region(struct iommu_resv_region *new, phys_addr_t top_end, iter_end = iter->start + iter->length - 1; /* no merge needed on elements of different types than @nr */ - if (iter->type != nr->type) { + if (iter->type != nr_type) { list_move_tail(&iter->list, &stack); continue; } -- 2.20.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu