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vm_object_shadow(): Add a DIAGNOSTIC check for shadowing a null object.

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From Charles Hannum <mycroft@netbsd.org>
This commit is contained in:
thorpej 1997-02-25 23:28:09 +00:00
parent a49641e340
commit cbb4319fb9
1 changed files with 6 additions and 1 deletions
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7
sys/vm/vm_object.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_object.c,v 1.44 1997/02/24 22:19:26 thorpej Exp $ */
/* $NetBSD: vm_object.c,v 1.45 1997/02/25 23:28:09 thorpej Exp $ */
/*-
* Copyright (c) 1997 Charles M. Hannum. All rights reserved.
@ -896,6 +896,11 @@ vm_object_shadow(object, offset, length)
source = *object;
#ifdef DIAGNOSTIC
if (source == NULL)
panic("vm_object_shadow: attempt to shadow null object");
#endif
/*
* Allocate a new object with the given length
*/