[src/trunk]: src/sys/kern Check the error code from es_setup_stack, and corre...

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

details:   https://anonhg.NetBSD.org/src/rev/e6070500af98
branches:  trunk
changeset: 811305:e6070500af98
user:      maxv <maxv%NetBSD.org@localhost>
date:      Thu Oct 22 11:38:51 2015 +0000

description:
Check the error code from es_setup_stack, and correctly free ep_emul_arg if
it fails.

That bug is harmless, since ep_setup_stack never fails.

diffstat:

 sys/kern/exec_elf.c |  16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

diffs (50 lines):

diff -r 9545d12f8b0c -r e6070500af98 sys/kern/exec_elf.c
--- a/sys/kern/exec_elf.c       Thu Oct 22 11:31:31 2015 +0000
+++ b/sys/kern/exec_elf.c       Thu Oct 22 11:38:51 2015 +0000
@@ -1,11 +1,11 @@
-/*     $NetBSD: exec_elf.c,v 1.77 2015/09/26 16:12:24 maxv Exp $       */
+/*     $NetBSD: exec_elf.c,v 1.78 2015/10/22 11:38:51 maxv Exp $       */
 
 /*-
- * Copyright (c) 1994, 2000, 2005 The NetBSD Foundation, Inc.
+ * Copyright (c) 1994, 2000, 2005, 2015 The NetBSD Foundation, Inc.
  * All rights reserved.
  *
  * This code is derived from software contributed to The NetBSD Foundation
- * by Christos Zoulas.
+ * by Christos Zoulas and Maxime Villard.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -57,7 +57,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(1, "$NetBSD: exec_elf.c,v 1.77 2015/09/26 16:12:24 maxv Exp $");
+__KERNEL_RCSID(1, "$NetBSD: exec_elf.c,v 1.78 2015/10/22 11:38:51 maxv Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_pax.h"
@@ -801,6 +801,7 @@
                epp->ep_entryoffset = interp_offset;
                epp->ep_entry = ap->arg_interp + interp_offset;
                PNBUF_PUT(interp);
+               interp = NULL;
        } else {
                epp->ep_entry = eh->e_entry;
                if (epp->ep_flags & EXEC_FORCEAUX) {
@@ -824,8 +825,13 @@
        NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0,
            epp->ep_vp, 0, VM_PROT_READ);
 #endif
+
+       error = (*epp->ep_esch->es_setup_stack)(l, epp);
+       if (error)
+               goto bad;
+
        kmem_free(ph, phsize);
-       return (*epp->ep_esch->es_setup_stack)(l, epp);
+       return 0;
 
 bad:
        if (interp)