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bh=fLeyEmIDBKrDFh0n7HTfHGe/2G6N1cRDbGx/nGccMf8=; b=JrCpAlsp9VZ/nVqQyt52xreSoMEiwTPGLgVfJ9eFUlcTnEoXdK5lPadMvyuYoD15pVUc3r zjr8VQpTxLnFPuUgKLX/GkfES2nISIAPkp2kL2KfOl1+KIAh6Ojm9YXcd7laydnccPWmh0 xXvyNvjmXoX/wyoe6sSaiufKXcZxHVg= X-MC-Unique: -RoMeQnDPyCCIJA9s6N63g-1 From: Jason Wang To: jasowang@redhat.com Subject: [PATCH] e1000: fail early for evil descriptor Date: Wed, 24 Feb 2021 13:45:28 +0800 Message-Id: <20210224054528.491866-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 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 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=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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_LOW=-0.7, RCVD_IN_MSPIKE_H4=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: Alexander Bulekov , Cheolwoo Myung , Ruhr-University Bochum , 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-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 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 d8da2f6528..4345d863e6 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 2.25.1