From 39b8e7dcaf04cbdb926b478f825b160d852752b5 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Wed, 15 Jul 2015 17:13:32 +0100 Subject: [PATCH] rtl8139: avoid nested ifs in IP header parsing (CVE-2015-5165) MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Transmit offload needs to parse packet headers. If header fields have unexpected values the offload processing is skipped. The code currently uses nested ifs because there is relatively little input validation. The next patches will add missing input validation and a goto label is more appropriate to avoid deep if statement nesting. Reported-by: 朱东海(启路) Reviewed-by: Jason Wang Signed-off-by: Stefan Hajnoczi --- hw/net/rtl8139.c | 41 ++++++++++++++++++++++------------------- 1 file changed, 22 insertions(+), 19 deletions(-) diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c index e0db4727ae..8731a30b71 100644 --- a/hw/net/rtl8139.c +++ b/hw/net/rtl8139.c @@ -2160,28 +2160,30 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s) size_t eth_payload_len = 0; int proto = be16_to_cpu(*(uint16_t *)(saved_buffer + 12)); - if (proto == ETH_P_IP) + if (proto != ETH_P_IP) { - DPRINTF("+++ C+ mode has IP packet\n"); - - /* not aligned */ - eth_payload_data = saved_buffer + ETH_HLEN; - eth_payload_len = saved_size - ETH_HLEN; - - ip = (ip_header*)eth_payload_data; - - if (IP_HEADER_VERSION(ip) != IP_HEADER_VERSION_4) { - DPRINTF("+++ C+ mode packet has bad IP version %d " - "expected %d\n", IP_HEADER_VERSION(ip), - IP_HEADER_VERSION_4); - ip = NULL; - } else { - hlen = IP_HEADER_LENGTH(ip); - ip_protocol = ip->ip_p; - ip_data_len = be16_to_cpu(ip->ip_len) - hlen; - } + goto skip_offload; } + DPRINTF("+++ C+ mode has IP packet\n"); + + /* not aligned */ + eth_payload_data = saved_buffer + ETH_HLEN; + eth_payload_len = saved_size - ETH_HLEN; + + ip = (ip_header*)eth_payload_data; + + if (IP_HEADER_VERSION(ip) != IP_HEADER_VERSION_4) { + DPRINTF("+++ C+ mode packet has bad IP version %d " + "expected %d\n", IP_HEADER_VERSION(ip), + IP_HEADER_VERSION_4); + goto skip_offload; + } + + hlen = IP_HEADER_LENGTH(ip); + ip_protocol = ip->ip_p; + ip_data_len = be16_to_cpu(ip->ip_len) - hlen; + if (ip) { if (txdw0 & CP_TX_IPCS) @@ -2377,6 +2379,7 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s) } } +skip_offload: /* update tally counter */ ++s->tally_counters.TxOk; -- 2.11.0