Release inpcb mutex while calling sbwait().

As sbwait() may sleep, holding any mutex is not allowed.  Call
pru_unlock() before sbwait() in soreceive().

Bug spotted by sashan@; OK sashan@ mvs@

diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
index 61d1ab7..5005fef 100644 (file)
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: uipc_socket.c,v 1.311 2023/12/19 01:11:21 bluhm Exp $ */
+/*     $OpenBSD: uipc_socket.c,v 1.312 2023/12/19 21:34:22 bluhm Exp $ */
 /*     $NetBSD: uipc_socket.c,v 1.21 1996/02/04 02:17:52 christos Exp $        */
 
 /*
@@ -1139,13 +1139,14 @@ dontblock:
                                break;
                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
+                       pru_unlock(so);
                        error = sbwait(so, &so->so_rcv);
                        if (error) {
                                sbunlock(so, &so->so_rcv);
-                               pru_unlock(so);
                                sounlock_shared(so);
                                return (0);
                        }
+                       pru_lock(so);
                        if ((m = so->so_rcv.sb_mb) != NULL)
                                nextrecord = m->m_nextpkt;
                }