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net/smc: Reset conn->lgr when link group registration fails 

SMC connections might fail to be registered in a link group due to
unable to find a usable link during its creation. As a result,
smc_conn_create() will return a failure and most resources related
to the connection won't be applied or initialized, such as
conn->abort_work or conn->lnk.

If smc_conn_free() is invoked later, it will try to access the
uninitialized resources related to the connection, thus causing
a warning or crash.

This patch tries to fix this by resetting conn->lgr to NULL if an
abnormal exit occurs in smc_lgr_register_conn(), thus avoiding the
access to uninitialized resources in smc_conn_free().

Meanwhile, the new created link group should be terminated if smc
connections can't be registered in it. So smc_lgr_cleanup_early() is
modified to take care of link group only and invoked to terminate
unusable link group by smc_conn_create(). The call to smc_conn_free()
is moved out from smc_lgr_cleanup_early() to smc_conn_abort().

Fixes: 56bc3b2094 ("net/smc: assign link to a new connection")
Suggested-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wen Gu 2022-01-06 20:42:08 +08:00 committed by David S. Miller
parent d5a73ec96c
commit 36595d8ad4
3 changed files with 13 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/smc/af_smc.c
View File

@ -632,10 +632,12 @@ static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
static void smc_conn_abort(struct smc_sock *smc, int local_first)
{
struct smc_connection *conn = &smc->conn;
struct smc_link_group *lgr = conn->lgr;
smc_conn_free(conn);
if (local_first)
smc_lgr_cleanup_early(&smc->conn);
else
smc_conn_free(&smc->conn);
smc_lgr_cleanup_early(lgr);
}
/* check if there is a rdma device available for this connection. */

12
net/smc/smc_core.c
View File

@ -171,9 +171,11 @@ static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
if (!conn->lgr->is_smcd) {
rc = smcr_lgr_conn_assign_link(conn, first);
if (rc)
if (rc) {
conn->lgr = NULL;
return rc;
}
}
/* find a new alert_token_local value not yet used by some connection
* in this link group
*/
@ -622,15 +624,13 @@ int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
}
void smc_lgr_cleanup_early(struct smc_connection *conn)
void smc_lgr_cleanup_early(struct smc_link_group *lgr)
{
struct smc_link_group *lgr = conn->lgr;
spinlock_t *lgr_lock;
if (!lgr)
return;
smc_conn_free(conn);
smc_lgr_list_head(lgr, &lgr_lock);
spin_lock_bh(lgr_lock);
/* do not use this link group for new connections */
@ -1832,9 +1832,11 @@ create:
write_lock_bh(&lgr->conns_lock);
rc = smc_lgr_register_conn(conn, true);
write_unlock_bh(&lgr->conns_lock);
if (rc)
if (rc) {
smc_lgr_cleanup_early(lgr);
goto out;
}
}
conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
conn->urg_state = SMC_URG_READ;

2
net/smc/smc_core.h
View File

@ -468,7 +468,7 @@ static inline void smc_set_pci_values(struct pci_dev *pci_dev,
struct smc_sock;
struct smc_clc_msg_accept_confirm;
void smc_lgr_cleanup_early(struct smc_connection *conn);
void smc_lgr_cleanup_early(struct smc_link_group *lgr);
void smc_lgr_terminate_sched(struct smc_link_group *lgr);
void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport);
void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport);