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smc: ETH_ALEN as memcpy length for mac addresses 

When creating an SMC connection, there is a CLC (connection layer control)
handshake to prepare for RDMA traffic. The corresponding code is part of
commit 0cfdd8f92c ("smc: connection and link group creation").
Mac addresses to be exchanged in the handshake are copied with a wrong
length of 12 instead of 6 bytes. Following code overwrites the wrongly
copied code, but nevertheless the correct length should already be used for
the preceding mac address copying. Use ETH_ALEN for the memcpy length with
mac addresses.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Fixes: 0cfdd8f92c ("smc: connection and link group creation")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2017-01-12 14:57:15 +01:00 committed by David S. Miller
parent 526735ddc0
commit 143c017108
2 changed files with 7 additions and 7 deletions
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10
net/smc/smc_clc.c
View File

@ -10,6 +10,7 @@
*/
#include <linux/in.h>
#include <linux/if_ether.h>
#include <net/sock.h>
#include <net/tcp.h>
@ -151,8 +152,7 @@ int smc_clc_send_proposal(struct smc_sock *smc,
pclc.hdr.version = SMC_CLC_V1; /* SMC version */
memcpy(pclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
memcpy(&pclc.lcl.gid, &smcibdev->gid[ibport - 1], SMC_GID_SIZE);
memcpy(&pclc.lcl.mac, &smcibdev->mac[ibport - 1],
sizeof(smcibdev->mac[ibport - 1]));
memcpy(&pclc.lcl.mac, &smcibdev->mac[ibport - 1], ETH_ALEN);
/* determine subnet and mask from internal TCP socket */
rc = smc_netinfo_by_tcpsk(smc->clcsock, &pclc.outgoing_subnet,
@ -199,8 +199,7 @@ int smc_clc_send_confirm(struct smc_sock *smc)
memcpy(cclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
memcpy(&cclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
SMC_GID_SIZE);
memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
sizeof(link->smcibdev->mac));
memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
hton24(cclc.qpn, link->roce_qp->qp_num);
cclc.rmb_rkey =
htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
@ -252,8 +251,7 @@ int smc_clc_send_accept(struct smc_sock *new_smc, int srv_first_contact)
memcpy(aclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
memcpy(&aclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
SMC_GID_SIZE);
memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1],
sizeof(link->smcibdev->mac[link->ibport - 1]));
memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
hton24(aclc.qpn, link->roce_qp->qp_num);
aclc.rmb_rkey =
htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);

4
net/smc/smc_ib.h
View File

@ -11,6 +11,7 @@
#ifndef _SMC_IB_H
#define _SMC_IB_H
#include <linux/if_ether.h>
#include <rdma/ib_verbs.h>
#define SMC_MAX_PORTS 2 /* Max # of ports */
@ -34,7 +35,8 @@ struct smc_ib_device { /* ib-device infos for smc */
struct ib_cq *roce_cq_recv; /* recv completion queue */
struct tasklet_struct send_tasklet; /* called by send cq handler */
struct tasklet_struct recv_tasklet; /* called by recv cq handler */
char mac[SMC_MAX_PORTS][6]; /* mac address per port*/
char mac[SMC_MAX_PORTS][ETH_ALEN];
/* mac address per port*/
union ib_gid gid[SMC_MAX_PORTS]; /* gid per port */
u8 initialized : 1; /* ib dev CQ, evthdl done */
struct work_struct port_event_work;