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[src/trunk]: src/sys/net Add KERNEL_LOCK in ppptioctl() to protect struct ppp...
details: https://anonhg.NetBSD.org/src/rev/38e5918ff742
branches: trunk
changeset: 838610:38e5918ff742
user: knakahara <knakahara%NetBSD.org@localhost>
date: Thu Jan 24 09:31:09 2019 +0000
description:
Add KERNEL_LOCK in ppptioctl() to protect struct ppp_softc members.
struct linesw.i_ioctl can be called without any preservation when the caller's
struct cdevsw is set D_MPSAFE such as ucom(4).
diffstat:
sys/net/ppp_tty.c | 17 +++++++++++++----
1 files changed, 13 insertions(+), 4 deletions(-)
diffs (45 lines):
diff -r 0846d34b45d7 -r 38e5918ff742 sys/net/ppp_tty.c
--- a/sys/net/ppp_tty.c Thu Jan 24 08:56:43 2019 +0000
+++ b/sys/net/ppp_tty.c Thu Jan 24 09:31:09 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ppp_tty.c,v 1.64 2018/02/07 06:19:43 mrg Exp $ */
+/* $NetBSD: ppp_tty.c,v 1.65 2019/01/24 09:31:09 knakahara Exp $ */
/* Id: ppp_tty.c,v 1.3 1996/07/01 01:04:11 paulus Exp */
/*
@@ -93,7 +93,7 @@
/* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ppp_tty.c,v 1.64 2018/02/07 06:19:43 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ppp_tty.c,v 1.65 2019/01/24 09:31:09 knakahara Exp $");
#ifdef _KERNEL_OPT
#include "ppp.h"
@@ -439,8 +439,15 @@
struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
int error, s;
- if (sc == NULL || tp != (struct tty *) sc->sc_devp)
- return (EPASSTHROUGH);
+ if (sc == NULL)
+ return (EPASSTHROUGH);
+
+ KERNEL_LOCK(1, NULL);
+
+ if (tp != (struct tty *) sc->sc_devp) {
+ error = EPASSTHROUGH;
+ goto out;
+ }
error = 0;
switch (cmd) {
@@ -492,6 +499,8 @@
pppgetm(sc);
}
+ out:
+ KERNEL_UNLOCK_ONE(NULL);
return error;
}
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