35 lines
1.0 KiB
Diff
35 lines
1.0 KiB
Diff
From 6c79ea275d72bc1fd88bdcf1e7d231b2c9c865de Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Wed, 15 Jul 2015 18:17:02 +0100
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Subject: [PATCH 5/7] rtl8139: check IP Total Length field
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The IP Total Length field includes the IP header and data. Make sure it
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is valid and does not exceed the Ethernet payload size.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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---
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hw/net/rtl8139.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
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index cd5ac05..ed2b23b 100644
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--- a/hw/net/rtl8139.c
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+++ b/hw/net/rtl8139.c
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@@ -2205,7 +2205,12 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
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}
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ip_protocol = ip->ip_p;
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- ip_data_len = be16_to_cpu(ip->ip_len) - hlen;
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+
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+ ip_data_len = be16_to_cpu(ip->ip_len);
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+ if (ip_data_len < hlen || ip_data_len > eth_payload_len) {
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+ goto skip_offload;
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+ }
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+ ip_data_len -= hlen;
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if (txdw0 & CP_TX_IPCS)
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{
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--
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2.1.4
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