Commit ce25d66a authored Jun 02, 2016 by Eric Dumazet Committed by David S. Miller Jun 02, 2016

Possible problem with e6afc8ac ("udp: remove headers from UDP packets before queueing")



Paul Moore tracked a regression caused by a recent commit, which
mistakenly assumed that sk_filter() could be avoided if socket
had no current BPF filter.

The intent was to avoid udp_lib_checksum_complete() overhead.

But sk_filter() also checks skb_pfmemalloc() and
security_sock_rcv_skb(), so better call it.

Fixes: e6afc8ac ("udp: remove headers from UDP packets before queueing")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Paul Moore <paul@paul-moore.com>
Tested-by: Paul Moore <paul@paul-moore.com>
Tested-by: Stephen Smalley <sds@tycho.nsa.gov>
Cc: samanthakumar <samanthakumar@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent f55d84b0

net/ipv4/udp.c

+5 −5

Original line number	Diff line number	Diff line
		@@ -1618,12 +1618,12 @@ int udp_queue_rcv_skb(struct sock sk, struct sk_buff skb)
		}
		}

		if (rcu_access_pointer(sk->sk_filter)) {
		if (udp_lib_checksum_complete(skb))
		if (rcu_access_pointer(sk->sk_filter) &&
		udp_lib_checksum_complete(skb))
		goto csum_error;

		if (sk_filter(sk, skb))
		goto drop;
		}

		udp_csum_pull_header(skb);
		if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {

net/ipv6/udp.c

+6 −6

Original line number	Diff line number	Diff line
		@@ -653,12 +653,12 @@ int udpv6_queue_rcv_skb(struct sock sk, struct sk_buff skb)
		}
		}

		if (rcu_access_pointer(sk->sk_filter)) {
		if (udp_lib_checksum_complete(skb))
		if (rcu_access_pointer(sk->sk_filter) &&
		udp_lib_checksum_complete(skb))
		goto csum_error;

		if (sk_filter(sk, skb))
		goto drop;
		}

		udp_csum_pull_header(skb);
		if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {