[src/trunk]: src/sys/kern fork(2): Plug leaks in proc_alloc error branch.

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

details:   https://anonhg.NetBSD.org/src/rev/a5bc357ccb1a
branches:  trunk
changeset: 368237:a5bc357ccb1a
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Fri Jul 01 01:05:21 2022 +0000

description:
fork(2): Plug leaks in proc_alloc error branch.

diffstat:

 sys/kern/kern_fork.c |  11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diffs (32 lines):

diff -r 72d6bd8f453b -r a5bc357ccb1a sys/kern/kern_fork.c
--- a/sys/kern/kern_fork.c      Fri Jul 01 01:04:59 2022 +0000
+++ b/sys/kern/kern_fork.c      Fri Jul 01 01:05:21 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_fork.c,v 1.227 2021/10/10 18:07:51 thorpej Exp $  */
+/*     $NetBSD: kern_fork.c,v 1.228 2022/07/01 01:05:21 riastradh Exp $        */
 
 /*-
  * Copyright (c) 1999, 2001, 2004, 2006, 2007, 2008, 2019
@@ -68,7 +68,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_fork.c,v 1.227 2021/10/10 18:07:51 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_fork.c,v 1.228 2022/07/01 01:05:21 riastradh Exp $");
 
 #include "opt_ktrace.h"
 #include "opt_dtrace.h"
@@ -309,6 +309,13 @@
        p2 = proc_alloc();
        if (p2 == NULL) {
                /* We were unable to allocate a process ID. */
+               uvm_uarea_free(uaddr);
+               mutex_enter(p1->p_lock);
+               cred = p1->p_cred;
+               uid = kauth_cred_getuid(cred);
+               (void)chgproccnt(uid, -1);
+               mutex_exit(p1->p_lock);
+               atomic_dec_uint(&nprocs);
                return EAGAIN;
        }