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gentoo-overlay/app-emulation/qemu/files/qemu-2.3.0-CVE-2015-5165-7....

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1.1 KiB

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