[src/trunk]: src/sys/dev/usb umidi(4): Fix fencepost in error branch.

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

details:   https://anonhg.NetBSD.org/src/rev/e367178f3ec5
branches:  trunk
changeset: 368195:e367178f3ec5
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Jun 27 18:56:56 2022 +0000

description:
umidi(4): Fix fencepost in error branch.

Reported-by: syzbot+0bbf3d81c15fd1354759%syzkaller.appspotmail.com@localhost

diffstat:

 sys/dev/usb/umidi.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (35 lines):

diff -r a9fd4b16af0f -r e367178f3ec5 sys/dev/usb/umidi.c
--- a/sys/dev/usb/umidi.c       Mon Jun 27 18:48:49 2022 +0000
+++ b/sys/dev/usb/umidi.c       Mon Jun 27 18:56:56 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: umidi.c,v 1.87 2022/04/17 13:15:15 riastradh Exp $     */
+/*     $NetBSD: umidi.c,v 1.88 2022/06/27 18:56:56 riastradh Exp $     */
 
 /*
  * Copyright (c) 2001, 2012, 2014 The NetBSD Foundation, Inc.
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: umidi.c,v 1.87 2022/04/17 13:15:15 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: umidi.c,v 1.88 2022/06/27 18:56:56 riastradh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_usb.h"
@@ -739,7 +739,7 @@
 
        ep = sc->sc_endpoints;
        for (i = sc->sc_out_num_endpoints+sc->sc_in_num_endpoints; i > 0; i--) {
-               err = alloc_pipe(ep++);
+               err = alloc_pipe(ep);
                if (err != USBD_NORMAL_COMPLETION) {
                        for (; ep != sc->sc_endpoints; ep--)
                                free_pipe(ep-1);
@@ -747,6 +747,7 @@
                        sc->sc_endpoints = sc->sc_out_ep = sc->sc_in_ep = NULL;
                        break;
                }
+               ep++;
        }
        return err;
 }