File xsa140-qemut-6.patch of Package xen.5854

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File xsa140-qemut-6.patch of Package xen.5854

References: bsc#939712 XSA-140

From 30aa7be430e7c982e9163f3bcc745d3aa57b6aa4 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Wed, 15 Jul 2015 18:17:03 +0100
Subject: [PATCH 6/7] rtl8139: skip offload on short TCP header

TCP Large Segment Offload accesses the TCP header in the packet.  If the
packet is too short we must not attempt to access header fields:

tcp_header *p_tcp_hdr = (tcp_header*)(eth_payload_data + hlen);
  int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr);

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
@@ -2162,6 +2162,11 @@ static int rtl8139_cplus_transmit_one(RT
 
             if ((txdw0 & CP_TX_LGSEN) && ip_protocol == IP_PROTO_TCP)
             {
+                /* Large enough for the TCP header? */
+                if (ip_data_len < sizeof(tcp_header)) {
+                    goto skip_offload;
+                }
+
                 int large_send_mss = (txdw0 >> 16) & CP_TC_LGSEN_MSS_MASK;
 
                 DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task TSO MTU=%d IP data %d frame data %d specified MSS=%d\n",

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File xsa140-qemut-6.patch of Package xen.5854

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