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Diffstat (limited to 'net/llc/llc_sap.c')
-rw-r--r--net/llc/llc_sap.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index 94cb706f6cc4..ad6e6e1cf22f 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;