[src/trunk]: src/sys/kern PT/54527: Anthony Mallet: Don't clear socket errors...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/40f34866fbfd
branches:  trunk
changeset: 1003407:40f34866fbfd
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Sep 14 14:09:54 2019 +0000

description:
PT/54527: Anthony Mallet: Don't clear socket errors for MSG_PEEK.

diffstat:

 sys/kern/uipc_socket.c |  19 +++++++++----------
 1 files changed, 9 insertions(+), 10 deletions(-)

diffs (49 lines):

diff -r 9f012db975d4 -r 40f34866fbfd sys/kern/uipc_socket.c
--- a/sys/kern/uipc_socket.c    Sat Sep 14 12:53:24 2019 +0000
+++ b/sys/kern/uipc_socket.c    Sat Sep 14 14:09:54 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uipc_socket.c,v 1.281 2019/07/16 22:57:55 pgoyette Exp $       */
+/*     $NetBSD: uipc_socket.c,v 1.282 2019/09/14 14:09:54 christos Exp $       */
 
 /*
  * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
@@ -71,7 +71,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.281 2019/07/16 22:57:55 pgoyette Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.282 2019/09/14 14:09:54 christos Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_compat_netbsd.h"
@@ -928,7 +928,8 @@
                }
                if (so->so_error) {
                        error = so->so_error;
-                       so->so_error = 0;
+                       if ((flags & MSG_PEEK) == 0)
+                               so->so_error = 0;
                        goto release;
                }
                if ((so->so_state & SS_ISCONNECTED) == 0) {
@@ -1225,15 +1226,13 @@
                        panic("receive 1");
 #endif
                if (so->so_error || so->so_rerror) {
+                       u_short *e;
                        if (m != NULL)
                                goto dontblock;
-                       if (so->so_error) {
-                               error = so->so_error;
-                               so->so_error = 0;
-                       } else {
-                               error = so->so_rerror;
-                               so->so_rerror = 0;
-                       }
+                       *e = so->so_error ? &so->so_error : &so->so_rerror;
+                       error = *e;
+                       if ((flags & MSG_PEEK) == 0)
+                               *e = 0;
                        goto release;
                }
                if (so->so_state & SS_CANTRCVMORE) {