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rtl8139: check IP Total Length field (CVE-2015-5165)

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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>
This commit is contained in:
Stefan Hajnoczi 2015-07-15 17:34:40 +01:00
parent 03247d43c5
commit c6296ea88d
1 changed files with 6 additions and 1 deletions
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7
hw/net/rtl8139.c
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@ -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)
{