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Mon, 15 Mar 2021 05:15:00 -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-64-ghufpY7_NhOCyiAc1_uDjg-1; Mon, 15 Mar 2021 05:14:56 -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 5E37C8042BE; Mon, 15 Mar 2021 09:14:55 +0000 (UTC) Received: from jason-ThinkPad-T430s.redhat.com (ovpn-13-105.pek2.redhat.com [10.72.13.105]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6F70C1007625; Mon, 15 Mar 2021 09:14:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1615799697; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type:in-reply-to:in-reply-to: references:references; bh=cHDylX3VDgnAxGpHNhSOXdMfRX+mhcDAqVY6r7JPZHo=; b=cxN/nn4/cYBkhee9YsQrI2ebtrEYZwAqYQbLWg6Rev03MNy3GA7MD6djoNu4he8dMn6wBo K9fRcg2/vjjxRYhhnZbovWIdhBb0wvcLdESVAuOoTzG5/N/73VSBBTiSnGEdXbHsKsDRMQ LynaxmX2RebAPEwluIMJnVhOF2uMfhI= X-MC-Unique: ghufpY7_NhOCyiAc1_uDjg-1 From: Jason Wang To: peter.maydell@linaro.org Subject: [PULL V2 04/20] e1000: fail early for evil descriptor Date: Mon, 15 Mar 2021 17:14:17 +0800 Message-Id: <1615799673-31549-5-git-send-email-jasowang@redhat.com> In-Reply-To: <1615799673-31549-1-git-send-email-jasowang@redhat.com> References: <1615799673-31549-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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=170.10.133.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.25, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: Jason Wang , qemu-stable@nongnu.org, qemu-devel@nongnu.org, Prasad J Pandit Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" During procss_tx_desc(), driver can try to chain data descriptor with legacy descriptor, when will lead underflow for the following calculation in process_tx_desc() for bytes: if (tp->size + bytes > msh) bytes =3D msh - tp->size; This will lead a infinite loop. So check and fail early if tp->size if greater or equal to msh. Reported-by: Alexander Bulekov Reported-by: Cheolwoo Myung Reported-by: Ruhr-University Bochum Cc: Prasad J Pandit Cc: qemu-stable@nongnu.org Signed-off-by: Jason Wang --- hw/net/e1000.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/net/e1000.c b/hw/net/e1000.c index d8da2f6..4345d86 100644 --- a/hw/net/e1000.c +++ b/hw/net/e1000.c @@ -670,6 +670,9 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp) msh =3D tp->tso_props.hdr_len + tp->tso_props.mss; do { bytes =3D split_size; + if (tp->size >=3D msh) { + goto eop; + } if (tp->size + bytes > msh) bytes =3D msh - tp->size; =20 @@ -695,6 +698,7 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp) tp->size +=3D split_size; } =20 +eop: if (!(txd_lower & E1000_TXD_CMD_EOP)) return; if (!(tp->cptse && tp->size < tp->tso_props.hdr_len)) { --=20 2.7.4