File xsa140-qemut-7.patch of Package xen.6738

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File xsa140-qemut-7.patch of Package xen.6738

References: bsc#939712 XSA-140

From 9a084807bf6ca7c16d997a236d304111894a6539 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Wed, 15 Jul 2015 18:17:04 +0100
Subject: [PATCH 7/7] rtl8139: check TCP Data Offset field

The TCP Data Offset field contains the length of the header.  Make sure
it is valid and does not exceed the IP data length.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 hw/rtl8139.c | 5 +++++
 1 file changed, 5 insertions(+)

Index: xen-4.4.2-testing/tools/qemu-xen-traditional-dir-remote/hw/rtl8139.c
===================================================================
--- xen-4.4.2-testing.orig/tools/qemu-xen-traditional-dir-remote/hw/rtl8139.c
+++ xen-4.4.2-testing/tools/qemu-xen-traditional-dir-remote/hw/rtl8139.c
@@ -2190,6 +2190,11 @@ static int rtl8139_cplus_transmit_one(RT
 
                 int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr);
 
+                /* Invalid TCP data offset? */
+                if (tcp_hlen < sizeof(tcp_header) || tcp_hlen > ip_data_len) {
+                    goto skip_offload;
+                }
+
                 /* ETH_MTU = ip header len + tcp header len + payload */
                 int tcp_data_len = ip_data_len - tcp_hlen;
                 int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen;

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File xsa140-qemut-7.patch of Package xen.6738

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