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net/bonding: fix potential out of bounds read

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Add validation to pointer constructed from the IPv4 header length
in order to prevent malformed packets from generating a potential
out of bounds memory read.

Fixes: 09150784a7 ("net/bonding: burst mode hash calculation")
Cc: stable@dpdk.org

Signed-off-by: Radu Nicolau <radu.nicolau@intel.com>
Acked-by: Chas Williams <chas3@att.com>
This commit is contained in:
Radu Nicolau 2019-04-17 15:36:47 +01:00 committed by Ferruh Yigit
parent 16c86b9843
commit 726158060d
1 changed files with 7 additions and 2 deletions
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9
drivers/net/bonding/rte_eth_bond_pmd.c
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@ -841,6 +841,7 @@ burst_xmit_l34_hash(struct rte_mbuf **buf, uint16_t nb_pkts,
for (i = 0; i < nb_pkts; i++) {
eth_hdr = rte_pktmbuf_mtod(buf[i], struct ether_hdr *);
size_t pkt_end = (size_t)eth_hdr + rte_pktmbuf_data_len(buf[i]);
proto = eth_hdr->ether_type;
vlan_offset = get_vlan_offset(eth_hdr, &proto);
l3hash = 0;
@ -864,13 +865,17 @@ burst_xmit_l34_hash(struct rte_mbuf **buf, uint16_t nb_pkts,
tcp_hdr = (struct tcp_hdr *)
((char *)ipv4_hdr +
ip_hdr_offset);
l4hash = HASH_L4_PORTS(tcp_hdr);
if ((size_t)tcp_hdr + sizeof(*tcp_hdr)
< pkt_end)
l4hash = HASH_L4_PORTS(tcp_hdr);
} else if (ipv4_hdr->next_proto_id ==
IPPROTO_UDP) {
udp_hdr = (struct udp_hdr *)
((char *)ipv4_hdr +
ip_hdr_offset);
l4hash = HASH_L4_PORTS(udp_hdr);
if ((size_t)udp_hdr + sizeof(*udp_hdr)
< pkt_end)
l4hash = HASH_L4_PORTS(udp_hdr);
}
}
} else if (rte_cpu_to_be_16(ETHER_TYPE_IPv6) == proto) {