File xsa140-qemut-3.patch of Package xen.2146

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File xsa140-qemut-3.patch of Package xen.2146

References: bsc#939712 XSA-140

From 043d28507ef7c5fdc34866f5e3b27a72bd0cd072 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Wed, 15 Jul 2015 18:17:00 +0100
Subject: [PATCH 3/7] rtl8139: skip offload on short Ethernet/IP header

Transmit offload features access Ethernet and IP headers the packet.  If
the packet is too short we must not attempt to access header fields:

int proto = be16_to_cpu(*(uint16_t *)(saved_buffer + 12));
  ...
  eth_payload_data = saved_buffer + ETH_HLEN;
  ...
  ip = (ip_header*)eth_payload_data;
  if (IP_HEADER_VERSION(ip) != IP_HEADER_VERSION_4) {

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
@@ -2103,6 +2103,11 @@ static int rtl8139_cplus_transmit_one(RT
             #define ETH_HLEN    14
             #define ETH_MTU     1500
 
+            /* Large enough for Ethernet and IP headers? */
+            if (saved_size < ETH_HLEN + sizeof(ip_header)) {
+                goto skip_offload;
+            }
+
             /* ip packet header */
             ip_header *ip = 0;
             int hlen = 0;

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File xsa140-qemut-3.patch of Package xen.2146

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