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rtl8139: check TCP Data Offset field (CVE-2015-5165)

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The TCP Data Offset field contains the length of the header.  Make sure
it is valid and does not exceed the IP data length.

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 17:39:29 +01:00
parent 4240be4563
commit 8357946b15
1 changed files with 5 additions and 0 deletions
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5
hw/net/rtl8139.c
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@ -2239,6 +2239,11 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr); 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 */ /* ETH_MTU = ip header len + tcp header len + payload */
int tcp_data_len = ip_data_len - tcp_hlen; int tcp_data_len = ip_data_len - tcp_hlen;
int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen; int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen;