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in extent_alloc_subregion1(), check for EXTENT_ALIGN() overflow when

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doing the boundary-case check.  approved by thorpej.
This commit is contained in:
mrg 2000-06-16 16:48:56 +00:00
parent dfbbcfb967
commit 8c758332be
1 changed files with 9 additions and 3 deletions
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12
sys/kern/subr_extent.c
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@ -1,4 +1,4 @@
/* $NetBSD: subr_extent.c,v 1.31 2000/06/06 17:32:50 thorpej Exp $ */
/* $NetBSD: subr_extent.c,v 1.32 2000/06/16 16:48:56 mrg Exp $ */
/*-
* Copyright (c) 1996, 1998 The NetBSD Foundation, Inc.
@ -673,7 +673,10 @@ extent_alloc_subregion1(ex, substart, subend, size, alignment, skew, boundary,
boundary, dontcross);
#endif
if (newend > dontcross) {
/* Check for overflow */
if (dontcross < ex->ex_start)
dontcross = ex->ex_end;
else if (newend > dontcross) {
/*
* Candidate region crosses boundary.
* Throw away the leading part and see
@ -764,7 +767,10 @@ extent_alloc_subregion1(ex, substart, subend, size, alignment, skew, boundary,
boundary, dontcross);
#endif
if (newend > dontcross) {
/* Check for overflow */
if (dontcross < ex->ex_start)
dontcross = ex->ex_end;
else if (newend > dontcross) {
/*
* Candidate region crosses boundary.
* Throw away the leading part and see