33 lines
1.1 KiB
Diff
33 lines
1.1 KiB
Diff
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/net/rtl8139.c | 5 +++++
|
|
1 file changed, 5 insertions(+)
|
|
|
|
diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
|
|
index c8f0df9..2df4a51 100644
|
|
--- a/hw/net/rtl8139.c
|
|
+++ b/hw/net/rtl8139.c
|
|
@@ -2253,6 +2253,11 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
|
|
|
|
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;
|
|
--
|
|
2.1.4
|
|
|