[src/trunk]: src/sys/netsmb Reject negative ioc_setupcnt.

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

details:   https://anonhg.NetBSD.org/src/rev/337f14104ac8
branches:  trunk
changeset: 355395:337f14104ac8
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Fri Jul 28 14:40:42 2017 +0000

description:
Reject negative ioc_setupcnt.

diffstat:

 sys/netsmb/smb_usr.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 77e42f4cf474 -r 337f14104ac8 sys/netsmb/smb_usr.c
--- a/sys/netsmb/smb_usr.c      Fri Jul 28 14:37:27 2017 +0000
+++ b/sys/netsmb/smb_usr.c      Fri Jul 28 14:40:42 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: smb_usr.c,v 1.18 2017/07/28 14:37:27 riastradh Exp $   */
+/*     $NetBSD: smb_usr.c,v 1.19 2017/07/28 14:40:42 riastradh Exp $   */
 
 /*
  * Copyright (c) 2000-2001 Boris Popov
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: smb_usr.c,v 1.18 2017/07/28 14:37:27 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: smb_usr.c,v 1.19 2017/07/28 14:40:42 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/malloc.h>
@@ -300,7 +300,7 @@
        struct mdchain *mdp;
        int error, len;
 
-       if (dp->ioc_setupcnt > 3)
+       if (dp->ioc_setupcnt < 0 || dp->ioc_setupcnt > 3)
                return EINVAL;
        error = smb_t2_alloc(SSTOCP(ssp), dp->ioc_setup[0], scred, &t2p);
        if (error)