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From 03247d43c577dfea8181cd40177ad5ba77c8db76 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Wed, 15 Jul 2015 17:32:32 +0100
Subject: [PATCH 4/7] rtl8139: check IP Header Length field (CVE-2015-5165)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Bug-Debian: http://bugs.debian.org/794610
The IP Header Length field was only checked in the IP checksum case, but
is used in other cases too.
Reported-by: 朱东海(启路) <donghai.zdh@alibaba-inc.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
hw/net/rtl8139.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index 1c62076..4eaa352 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -2186,6 +2186,10 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
}
hlen = IP_HEADER_LENGTH(ip);
+ if (hlen < sizeof(ip_header) || hlen > eth_payload_len) {
+ goto skip_offload;
+ }
+
ip_protocol = ip->ip_p;
ip_data_len = be16_to_cpu(ip->ip_len) - hlen;
@@ -2193,17 +2197,10 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
{
DPRINTF("+++ C+ mode need IP checksum\n");
- if (hlen<sizeof(ip_header) || hlen>eth_payload_len) {/* min header length */
- /* bad packet header len */
- /* or packet too short */
- }
- else
- {
- ip->ip_sum = 0;
- ip->ip_sum = ip_checksum(ip, hlen);
- DPRINTF("+++ C+ mode IP header len=%d checksum=%04x\n",
- hlen, ip->ip_sum);
- }
+ ip->ip_sum = 0;
+ ip->ip_sum = ip_checksum(ip, hlen);
+ DPRINTF("+++ C+ mode IP header len=%d checksum=%04x\n",
+ hlen, ip->ip_sum);
}
if ((txdw0 & CP_TX_LGSEN) && ip_protocol == IP_PROTO_TCP)
--
2.5.0
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