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From c6296ea88df040054ccd781f3945fe103f8c7c17 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Wed, 15 Jul 2015 17:34:40 +0100
Subject: [PATCH 5/7] rtl8139: check IP Total 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 Total Length field includes the IP header and data. Make sure it
is valid and does not exceed the Ethernet payload size.
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 | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index 4eaa352..6859d76 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -2191,7 +2191,12 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
}
ip_protocol = ip->ip_p;
- ip_data_len = be16_to_cpu(ip->ip_len) - hlen;
+
+ ip_data_len = be16_to_cpu(ip->ip_len);
+ if (ip_data_len < hlen || ip_data_len > eth_payload_len) {
+ goto skip_offload;
+ }
+ ip_data_len -= hlen;
if (txdw0 & CP_TX_IPCS)
{
--
2.5.0
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