1 files changed, 21 insertions, 13 deletions

diff --git a/net/mctp/route.c b/net/mctp/route.c
index f9a80b82dc51..f51a05ec7162 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -147,6 +147,7 @@ static struct mctp_sk_key *mctp_key_alloc(struct mctp_sock *msk,
 	key->valid = true;
 	spin_lock_init(&key->lock);
 	refcount_set(&key->refs, 1);
+	sock_hold(key->sk);
 
 	return key;
 }
@@ -165,6 +166,7 @@ void mctp_key_unref(struct mctp_sk_key *key)
 	mctp_dev_release_key(key->dev, key);
 	spin_unlock_irqrestore(&key->lock, flags);
 
+	sock_put(key->sk);
 	kfree(key);
 }
 
@@ -177,6 +179,11 @@ static int mctp_key_add(struct mctp_sk_key *key, struct mctp_sock *msk)
 
 	spin_lock_irqsave(&net->mctp.keys_lock, flags);
 
+	if (sock_flag(&msk->sk, SOCK_DEAD)) {
+		rc = -EINVAL;
+		goto out_unlock;
+	}
+
 	hlist_for_each_entry(tmp, &net->mctp.keys, hlist) {
 		if (mctp_key_match(tmp, key->local_addr, key->peer_addr,
 				   key->tag)) {
@@ -198,6 +205,7 @@ static int mctp_key_add(struct mctp_sk_key *key, struct mctp_sock *msk)
 		hlist_add_head(&key->sklist, &msk->keys);
 	}
 
+out_unlock:
 	spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
 
 	return rc;
@@ -315,8 +323,8 @@ static int mctp_frag_queue(struct mctp_sk_key *key, struct sk_buff *skb)
 
 static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
 {
+	struct mctp_sk_key *key, *any_key = NULL;
 	struct net *net = dev_net(skb->dev);
-	struct mctp_sk_key *key;
 	struct mctp_sock *msk;
 	struct mctp_hdr *mh;
 	unsigned long f;
@@ -361,13 +369,11 @@ static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
 			 * key for reassembly - we'll create a more specific
 			 * one for future packets if required (ie, !EOM).
 			 */
-			key = mctp_lookup_key(net, skb, MCTP_ADDR_ANY, &f);
-			if (key) {
-				msk = container_of(key->sk,
+			any_key = mctp_lookup_key(net, skb, MCTP_ADDR_ANY, &f);
+			if (any_key) {
+				msk = container_of(any_key->sk,
 						   struct mctp_sock, sk);
-				spin_unlock_irqrestore(&key->lock, f);
-				mctp_key_unref(key);
-				key = NULL;
+				spin_unlock_irqrestore(&any_key->lock, f);
 			}
 		}
 
@@ -419,14 +425,14 @@ static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
 			 * this function.
 			 */
 			rc = mctp_key_add(key, msk);
-			if (rc) {
-				kfree(key);
-			} else {
+			if (!rc)
 				trace_mctp_key_acquire(key);
 
-				/* we don't need to release key->lock on exit */
-				mctp_key_unref(key);
-			}
+			/* we don't need to release key->lock on exit, so
+			 * clean up here and suppress the unlock via
+			 * setting to NULL
+			 */
+			mctp_key_unref(key);
 			key = NULL;
 
 		} else {
@@ -473,6 +479,8 @@ out_unlock:
 		spin_unlock_irqrestore(&key->lock, f);
 		mctp_key_unref(key);
 	}
+	if (any_key)
+		mctp_key_unref(any_key);
 out:
 	if (rc)
 		kfree_skb(skb);