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Merge branch 'net-smc-fixes-2021-11-24'

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Karsten Graul says:

====================
net/smc: fixes 2021-11-24

Patch 1 from DaXing fixes a possible loop in smc_listen().
Patch 2 prevents a NULL pointer dereferencing while iterating
over the lower network devices.
====================

Link: https://lore.kernel.org/r/20211124123238.471429-1-kgraul@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2021-11-24 19:02:23 -08:00
commit fef30d6371
2 changed files with 21 additions and 18 deletions
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4
net/smc/af_smc.c
View File

@ -2134,8 +2134,10 @@ static int smc_listen(struct socket *sock, int backlog)
smc->clcsock->sk->sk_user_data =
(void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
rc = kernel_listen(smc->clcsock, backlog);
if (rc)
if (rc) {
smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
goto out;
}
sk->sk_max_ack_backlog = backlog;
sk->sk_ack_backlog = 0;
sk->sk_state = SMC_LISTEN;

35
net/smc/smc_core.c
View File

@ -1672,14 +1672,26 @@ static void smc_link_down_work(struct work_struct *work)
mutex_unlock(&lgr->llc_conf_mutex);
}
/* Determine vlan of internal TCP socket.
* @vlan_id: address to store the determined vlan id into
*/
static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev,
struct netdev_nested_priv *priv)
{
unsigned short *vlan_id = (unsigned short *)priv->data;
if (is_vlan_dev(lower_dev)) {
*vlan_id = vlan_dev_vlan_id(lower_dev);
return 1;
}
return 0;
}
/* Determine vlan of internal TCP socket. */
int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
{
struct dst_entry *dst = sk_dst_get(clcsock->sk);
struct netdev_nested_priv priv;
struct net_device *ndev;
int i, nest_lvl, rc = 0;
int rc = 0;
ini->vlan_id = 0;
if (!dst) {
@ -1697,20 +1709,9 @@ int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
goto out_rel;
}
priv.data = (void *)&ini->vlan_id;
rtnl_lock();
nest_lvl = ndev->lower_level;
for (i = 0; i < nest_lvl; i++) {
struct list_head *lower = &ndev->adj_list.lower;
if (list_empty(lower))
break;
lower = lower->next;
ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
if (is_vlan_dev(ndev)) {
ini->vlan_id = vlan_dev_vlan_id(ndev);
break;
}
}
netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv);
rtnl_unlock();
out_rel: