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net/smc: fix listen processing for SMC-Rv2

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In the process of checking whether RDMAv2 is available, the current
implementation first sets ini->smcrv2.ib_dev_v2, and then allocates
smc buf desc, but the latter may fail. Unfortunately, the caller
will only check the former. In this case, a NULL pointer reference
will occur in smc_clc_send_confirm_accept() when accessing
conn->rmb_desc.

This patch does two things:
1. Use the return code to determine whether V2 is available.
2. If the return code is NODEV, continue to check whether V1 is
available.

Fixes: e49300a6bf ("net/smc: add listen processing for SMC-Rv2")
Signed-off-by: liuyacan <liuyacan@corp.netease.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
liuyacan 2022-05-23 13:50:56 +08:00 committed by David S. Miller
parent 75c1edf23b
commit 8c3b8dc5cc
1 changed files with 27 additions and 17 deletions
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44
net/smc/af_smc.c
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@ -2093,13 +2093,13 @@ static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
return 0;
}
static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
struct smc_clc_msg_proposal *pclc,
struct smc_init_info *ini)
static int smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
struct smc_clc_msg_proposal *pclc,
struct smc_init_info *ini)
{
struct smc_clc_v2_extension *smc_v2_ext;
u8 smcr_version;
int rc;
int rc = 0;
if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
goto not_found;
@ -2117,26 +2117,31 @@ static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
rc = smc_find_rdma_device(new_smc, ini);
if (rc) {
smc_find_ism_store_rc(rc, ini);
if (rc)
goto not_found;
}
if (!ini->smcrv2.uses_gateway)
memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
smcr_version = ini->smcr_version;
ini->smcr_version = SMC_V2;
rc = smc_listen_rdma_init(new_smc, ini);
if (!rc)
rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
if (!rc)
return;
ini->smcr_version = smcr_version;
smc_find_ism_store_rc(rc, ini);
if (rc) {
ini->smcr_version = smcr_version;
goto not_found;
}
rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
if (rc) {
ini->smcr_version = smcr_version;
goto not_found;
}
return 0;
not_found:
rc = rc ?: SMC_CLC_DECL_NOSMCDEV;
ini->smcr_version &= ~SMC_V2;
ini->check_smcrv2 = false;
return rc;
}
static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
@ -2169,6 +2174,7 @@ static int smc_listen_find_device(struct smc_sock *new_smc,
struct smc_init_info *ini)
{
int prfx_rc;
int rc;
/* check for ISM device matching V2 proposed device */
smc_find_ism_v2_device_serv(new_smc, pclc, ini);
@ -2196,14 +2202,18 @@ static int smc_listen_find_device(struct smc_sock *new_smc,
return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
/* check if RDMA V2 is available */
smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
if (ini->smcrv2.ib_dev_v2)
rc = smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
if (!rc)
return 0;
/* skip V1 check if V2 is unavailable for non-Device reason */
if (rc != SMC_CLC_DECL_NOSMCDEV &&
rc != SMC_CLC_DECL_NOSMCRDEV &&
rc != SMC_CLC_DECL_NOSMCDDEV)
return rc;
/* check if RDMA V1 is available */
if (!prfx_rc) {
int rc;
rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
smc_find_ism_store_rc(rc, ini);
return (!rc) ? 0 : ini->rc;