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From a8cef763585fecc8b89d006efca0e000df923d36 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Fri, 31 Jul 2015 15:59:48 +0200
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Subject: [PATCH 7/7] rtl8139: check TCP Data Offset field (CVE-2015-5165)
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Message-id: <1438358388-10575-8-git-send-email-stefanha@redhat.com>
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Patchwork-id: 67242
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O-Subject: [RHEL-7.1.z qemu-kvm EMBARGOED PATCH 7/7] rtl8139: check TCP Data Offset field (CVE-2015-5165)
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Bugzilla: 1248764
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Xiao Wang <jasowang@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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The TCP Data Offset field contains the length of the header. Make sure
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it is valid and does not exceed the IP data length.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/net/rtl8139.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
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index c9bf454..4f89328 100644
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--- a/hw/net/rtl8139.c
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+++ b/hw/net/rtl8139.c
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@@ -2231,6 +2231,11 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
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int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr);
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+ /* Invalid TCP data offset? */
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+ if (tcp_hlen < sizeof(tcp_header) || tcp_hlen > ip_data_len) {
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+ goto skip_offload;
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+ }
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+
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/* ETH_MTU = ip header len + tcp header len + payload */
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int tcp_data_len = ip_data_len - tcp_hlen;
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int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen;
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--
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1.8.3.1
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