Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Cross-merge bpf fixes after downstream PR.

No conflicts.

Adjacent changes in:
Auto-merging include/linux/bpf.h
Auto-merging include/linux/bpf_verifier.h
Auto-merging kernel/bpf/btf.c
Auto-merging kernel/bpf/verifier.c
Auto-merging kernel/trace/bpf_trace.c
Auto-merging tools/testing/selftests/bpf/progs/test_tp_btf_nullable.c

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

4 files changed, 55 insertions, 40 deletions

diff --git a/net/core/filter.c b/net/core/filter.c
index 6625b3f563a4..21131ec25f24 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -7899,42 +7899,37 @@ static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv6_proto = {
 
 #endif /* CONFIG_INET */
 
-bool bpf_helper_changes_pkt_data(void *func)
-{
-	if (func == bpf_skb_vlan_push ||
-	    func == bpf_skb_vlan_pop ||
-	    func == bpf_skb_store_bytes ||
-	    func == bpf_skb_change_proto ||
-	    func == bpf_skb_change_head ||
-	    func == sk_skb_change_head ||
-	    func == bpf_skb_change_tail ||
-	    func == sk_skb_change_tail ||
-	    func == bpf_skb_adjust_room ||
-	    func == sk_skb_adjust_room ||
-	    func == bpf_skb_pull_data ||
-	    func == sk_skb_pull_data ||
-	    func == bpf_clone_redirect ||
-	    func == bpf_l3_csum_replace ||
-	    func == bpf_l4_csum_replace ||
-	    func == bpf_xdp_adjust_head ||
-	    func == bpf_xdp_adjust_meta ||
-	    func == bpf_msg_pull_data ||
-	    func == bpf_msg_push_data ||
-	    func == bpf_msg_pop_data ||
-	    func == bpf_xdp_adjust_tail ||
-#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
-	    func == bpf_lwt_seg6_store_bytes ||
-	    func == bpf_lwt_seg6_adjust_srh ||
-	    func == bpf_lwt_seg6_action ||
-#endif
-#ifdef CONFIG_INET
-	    func == bpf_sock_ops_store_hdr_opt ||
-#endif
-	    func == bpf_lwt_in_push_encap ||
-	    func == bpf_lwt_xmit_push_encap)
+bool bpf_helper_changes_pkt_data(enum bpf_func_id func_id)
+{
+	switch (func_id) {
+	case BPF_FUNC_clone_redirect:
+	case BPF_FUNC_l3_csum_replace:
+	case BPF_FUNC_l4_csum_replace:
+	case BPF_FUNC_lwt_push_encap:
+	case BPF_FUNC_lwt_seg6_action:
+	case BPF_FUNC_lwt_seg6_adjust_srh:
+	case BPF_FUNC_lwt_seg6_store_bytes:
+	case BPF_FUNC_msg_pop_data:
+	case BPF_FUNC_msg_pull_data:
+	case BPF_FUNC_msg_push_data:
+	case BPF_FUNC_skb_adjust_room:
+	case BPF_FUNC_skb_change_head:
+	case BPF_FUNC_skb_change_proto:
+	case BPF_FUNC_skb_change_tail:
+	case BPF_FUNC_skb_pull_data:
+	case BPF_FUNC_skb_store_bytes:
+	case BPF_FUNC_skb_vlan_pop:
+	case BPF_FUNC_skb_vlan_push:
+	case BPF_FUNC_store_hdr_opt:
+	case BPF_FUNC_xdp_adjust_head:
+	case BPF_FUNC_xdp_adjust_meta:
+	case BPF_FUNC_xdp_adjust_tail:
+	/* tail-called program could call any of the above */
+	case BPF_FUNC_tail_call:
 		return true;
-
-	return false;
+	default:
+		return false;
+	}
 }
 
 const struct bpf_func_proto bpf_event_output_data_proto __weak;
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index ae34ac818cda..b5cd3ae4f04c 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -449,6 +449,21 @@ out_free:
 	goto out;
 }
 
+static LLIST_HEAD(defer_free_list);
+
+static void net_complete_free(void)
+{
+	struct llist_node *kill_list;
+	struct net *net, *next;
+
+	/* Get the list of namespaces to free from last round. */
+	kill_list = llist_del_all(&defer_free_list);
+
+	llist_for_each_entry_safe(net, next, kill_list, defer_free_list)
+		kmem_cache_free(net_cachep, net);
+
+}
+
 static void net_free(struct net *net)
 {
 	if (refcount_dec_and_test(&net->passive)) {
@@ -457,7 +472,8 @@ static void net_free(struct net *net)
 		/* There should not be any trackers left there. */
 		ref_tracker_dir_exit(&net->notrefcnt_tracker);
 
-		kmem_cache_free(net_cachep, net);
+		/* Wait for an extra rcu_barrier() before final free. */
+		llist_add(&net->defer_free_list, &defer_free_list);
 	}
 }
 
@@ -642,6 +658,8 @@ static void cleanup_net(struct work_struct *work)
 	 */
 	rcu_barrier();
 
+	net_complete_free();
+
 	/* Finally it is safe to free my network namespace structure */
 	list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {
 		list_del_init(&net->exit_list);
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index ab5f201bf0ab..ebcfc2debf1a 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3972,8 +3972,10 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 		if (ops->peer_type) {
 			peer_net = rtnl_get_peer_net(ops, data, extack);
-			if (IS_ERR(peer_net))
+			if (IS_ERR(peer_net)) {
+				ret = PTR_ERR(peer_net);
 				goto put_ops;
+			}
 			if (peer_net)
 				rtnl_nets_add(&rtnl_nets, peer_net);
 		}
diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index 78347d7d25ef..f1b9b3958792 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -159,6 +159,7 @@ static void sock_map_del_link(struct sock *sk,
 				verdict_stop = true;
 			list_del(&link->list);
 			sk_psock_free_link(link);
+			break;
 		}
 	}
 	spin_unlock_bh(&psock->link_lock);
@@ -411,12 +412,11 @@ static void *sock_map_lookup_sys(struct bpf_map *map, void *key)
 static int __sock_map_delete(struct bpf_stab *stab, struct sock *sk_test,
 			     struct sock **psk)
 {
-	struct sock *sk;
+	struct sock *sk = NULL;
 	int err = 0;
 
 	spin_lock_bh(&stab->lock);
-	sk = *psk;
-	if (!sk_test || sk_test == sk)
+	if (!sk_test || sk_test == *psk)
 		sk = xchg(psk, NULL);
 
 	if (likely(sk))