[RESEND PATCH bpf] udp: validate checksum in udp_read_sock()

From: Cong Wang <redacted>

It turns out the skb's in sock receive queue could have
bad checksums, as both ->poll() and ->recvmsg() validate
checksums. We have to do the same for ->read_sock() path
too before they are redirected in sockmap.

Fixes: d7f571188ecf ("udp: Implement ->read_sock() for sockmap")
Reported-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Cc: Lorenz Bauer <redacted>
Cc: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Cong Wang <redacted>
---
 net/ipv4/udp.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 319dd7bbfe33..8bcecdd6aeda 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c

@@ -1807,6 +1807,17 @@ int udp_read_sock(struct sock *sk, read_descriptor_t *desc,
 		skb = skb_recv_udp(sk, 0, 1, &err);
 		if (!skb)
 			return err;
+
+		if (udp_lib_checksum_complete(skb)) {
+			__UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS,
+					IS_UDPLITE(sk));
+			__UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
+					IS_UDPLITE(sk));
+			atomic_inc(&sk->sk_drops);
+			kfree_skb(skb);
+			continue;
+		}
+
 		used = recv_actor(desc, skb, 0, skb->len);
 		if (used <= 0) {
 			if (!copied)

-- 
2.30.2