Protect the receive socket buffer in UDP input with per PCB mutex.

OK claudio@ mvs@

diff --git a/sys/netinet/udp_usrreq.c b/sys/netinet/udp_usrreq.c
index 2edbff0..ea39aaa 100644 (file)
--- a/sys/netinet/udp_usrreq.c
+++ b/sys/netinet/udp_usrreq.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: udp_usrreq.c,v 1.294 2022/08/29 08:08:17 mvs Exp $    */
+/*     $OpenBSD: udp_usrreq.c,v 1.295 2022/08/30 09:35:24 bluhm Exp $  */
 /*     $NetBSD: udp_usrreq.c,v 1.28 1996/03/16 23:54:03 christos Exp $ */
 
 /*
@@ -657,12 +657,17 @@ udp_sbappend(struct inpcb *inp, struct mbuf *m, struct ip *ip,
        }
 #endif
        m_adj(m, hlen);
+
+       mtx_enter(&inp->inp_mtx);
        if (sbappendaddr(so, &so->so_rcv, srcaddr, m, opts) == 0) {
+               mtx_leave(&inp->inp_mtx);
                udpstat_inc(udps_fullsock);
                m_freem(m);
                m_freem(opts);
                return;
        }
+       mtx_leave(&inp->inp_mtx);
+
        sorwakeup(so);
 }