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Thu, 15 Oct 2020 04:00:43 -0400 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-500-d-7153-jPKunAR-daNglXw-1; Thu, 15 Oct 2020 04:00:36 -0400 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 EBE3918C89D0; Thu, 15 Oct 2020 08:00:34 +0000 (UTC) Received: from f32-work.redhat.com (unknown [10.40.194.72]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8A4BA10013D7; Thu, 15 Oct 2020 08:00:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602748839; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=nzZoV21xGCaBHRJLgLm4C8B75TwqLeTYx5aO+rkq//s=; b=PxJPln7IiyYoC/Bptw3hKS/Phlqyj4RwVptjkNg+upR1nk1h77O5A/f8xWkaZFl7rUPfpy VsiCTqAs0FjP1TUWBwnFxjZBV0XlfxGrrhV+agWf5vEok2FET1iE12MVcWJAvXsd7v6SPp 4d8lGwRHyX+KTKyQ/IBVkkdm3oa5pG8= X-MC-Unique: d-7153-jPKunAR-daNglXw-1 From: Mauro Matteo Cascella To: qemu-devel@nongnu.org Subject: [PATCH v2] hw/usb/hcd-dwc2: fix divide-by-zero in dwc2_handle_packet() Date: Thu, 15 Oct 2020 09:59:57 +0200 Message-Id: <20201015075957.268823-1-mcascell@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mcascell@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=mcascell@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/15 02:10:02 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: gaoning.pgn@antgroup.com, mcascell@redhat.com, linyi.lxw@antfin.com, kraxel@redhat.com, pauldzim@gmail.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Check the value of mps to avoid potential divide-by-zero later in the funct= ion. Since HCCHAR_MPS is guest controllable, this prevents a malicious/buggy gue= st from crashing the QEMU process on the host. Signed-off-by: Mauro Matteo Cascella Reviewed-by: Paul Zimmerman Reported-by: Gaoning Pan Reported-by: Xingwei Lin Tested-by: Paul Zimmerman --- Moved check earlier in the function and added "Reviewed-by" line. hw/usb/hcd-dwc2.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/hw/usb/hcd-dwc2.c b/hw/usb/hcd-dwc2.c index 97688d21bf..9856c4540c 100644 --- a/hw/usb/hcd-dwc2.c +++ b/hw/usb/hcd-dwc2.c @@ -245,6 +245,12 @@ static void dwc2_handle_packet(DWC2State *s, uint32_t = devadr, USBDevice *dev, trace_usb_dwc2_handle_packet(chan, dev, &p->packet, epnum, types[eptyp= e], dirs[epdir], mps, len, pcnt); =20 + if (mps =3D=3D 0) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Bad HCCHAR_MPS set to zero\n", __func__); + return; + } + if (eptype =3D=3D USB_ENDPOINT_XFER_CONTROL && pid =3D=3D TSIZ_SC_MC_P= ID_SETUP) { pid =3D USB_TOKEN_SETUP; } else { --=20 2.26.2