diff options
| author | Wen Gu <guwen@linux.alibaba.com> | 2022-01-06 20:42:08 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-01-06 13:54:06 +0000 |
| commit | 36595d8ad46d9e4c41cc7c48c4405b7c3322deac (patch) | |
| tree | 1acb7ddbaf531aa7199f74e1f7f6d3ce8f2e1404 /net/smc/smc_core.c | |
| parent | d5a73ec96cc57cf67e51b12820fc2354e7ca46f8 (diff) | |
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: 56bc3b2094b4 ("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>
Diffstat (limited to 'net/smc/smc_core.c')
| -rw-r--r-- | net/smc/smc_core.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index a6849362f4dd..c9a8092c4ac9 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -171,8 +171,10 @@ 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 */ @@ -1832,8 +1832,10 @@ 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; |