[src/netbsd-8]: src/sys/netipsec Pull up following revision(s) (requested by ...

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

details:   https://anonhg.NetBSD.org/src/rev/22d3bd92479a
branches:  netbsd-8
changeset: 851946:22d3bd92479a
user:      martin <martin%NetBSD.org@localhost>
date:      Sat Aug 25 14:35:21 2018 +0000

description:
Pull up following revision(s) (requested by ozaki-r in ticket #986):

        sys/netipsec/key.c: revision 1.257

Don't call key_ismyaddr, which may sleep, in a pserialize read section

Use mutex here instead of pserialize because using mutex is simpler than
using psz+ref, which is another solution, and key_checkspidup isn't called in
any performance-sensitive paths.

diffstat:

 sys/netipsec/key.c |  14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diffs (50 lines):

diff -r c1cd4e754a80 -r 22d3bd92479a sys/netipsec/key.c
--- a/sys/netipsec/key.c        Sat Aug 25 14:33:04 2018 +0000
+++ b/sys/netipsec/key.c        Sat Aug 25 14:35:21 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: key.c,v 1.163.2.9 2018/04/18 14:06:24 martin Exp $     */
+/*     $NetBSD: key.c,v 1.163.2.10 2018/08/25 14:35:21 martin Exp $    */
 /*     $FreeBSD: src/sys/netipsec/key.c,v 1.3.2.3 2004/02/14 22:23:23 bms Exp $        */
 /*     $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $   */
 
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: key.c,v 1.163.2.9 2018/04/18 14:06:24 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: key.c,v 1.163.2.10 2018/08/25 14:35:21 martin Exp $");
 
 /*
  * This code is referred to RFC 2367
@@ -3458,7 +3458,6 @@
 {
        struct secashead *sah;
        struct secasvar *sav;
-       int s;
 
        /* check address family */
        if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) {
@@ -3467,18 +3466,19 @@
        }
 
        /* check all SAD */
-       s = pserialize_read_enter();
-       SAHLIST_READER_FOREACH(sah) {
+       /* key_ismyaddr may sleep, so use mutex, not pserialize, here. */
+       mutex_enter(&key_sad.lock);
+       SAHLIST_WRITER_FOREACH(sah) {
                if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst))
                        continue;
                sav = key_getsavbyspi(sah, spi);
                if (sav != NULL) {
-                       pserialize_read_exit(s);
                        KEY_SA_UNREF(&sav);
+                       mutex_exit(&key_sad.lock);
                        return true;
                }
        }
-       pserialize_read_exit(s);
+       mutex_exit(&key_sad.lock);
 
        return false;
 }