diff options
Diffstat (limited to 'net/llc/llc_sap.c')
| -rw-r--r-- | net/llc/llc_sap.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c index 94cb706f6cc..ad6e6e1cf22 100644 --- a/net/llc/llc_sap.c +++ b/net/llc/llc_sap.c @@ -321,10 +321,12 @@ static struct sock *llc_lookup_dgram(struct llc_sap *sap, { struct sock *rc; struct hlist_nulls_node *node; + int slot = llc_sk_laddr_hashfn(sap, laddr); + struct hlist_nulls_head *laddr_hb = &sap->sk_laddr_hash[slot]; rcu_read_lock_bh(); again: - sk_nulls_for_each_rcu(rc, node, &sap->sk_list) { + sk_nulls_for_each_rcu(rc, node, laddr_hb) { if (llc_dgram_match(sap, laddr, rc)) { /* Extra checks required by SLAB_DESTROY_BY_RCU */ if (unlikely(!atomic_inc_not_zero(&rc->sk_refcnt))) @@ -338,6 +340,13 @@ again: } } rc = NULL; + /* + * if the nulls value we got at the end of this lookup is + * not the expected one, we must restart lookup. + * We probably met an item that was moved to another chain. + */ + if (unlikely(get_nulls_value(node) != slot)) + goto again; found: rcu_read_unlock_bh(); return rc; |