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fixed lease table overflow crash [#38637]

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This commit is contained in:
Francis Dupont
2015-04-10 13:15:40 +02:00
parent 1b43d5e0d9
commit 653f509b52
1 changed files with 16 additions and 2 deletions
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18
server/mdb.c
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@@ -3,7 +3,7 @@
Server-specific in-memory database support. */
/*
* Copyright (c) 2011-2014 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 2011-2015 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 2004-2009 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996-2003 by Internet Software Consortium
*
@@ -761,6 +761,7 @@ void new_address_range (cfile, low, high, subnet, pool, lpchain)
{
#if defined(COMPACT_LEASES)
struct lease *address_range;
unsigned n, s;
#endif
unsigned min, max, i;
char lowbuf [16], highbuf [16], netbuf [16];
@@ -820,7 +821,20 @@ void new_address_range (cfile, low, high, subnet, pool, lpchain)
/* Get a lease structure for each address in the range. */
#if defined (COMPACT_LEASES)
address_range = new_leases (max - min + 1, MDL);
n = max - min + 1;
s = (n + 1) * sizeof (struct lease);
/* Check unsigned overflow in new_leases().
With 304 byte lease structure (x64_86), this happens at
range 10.0.0.0 10.215.148.52; */
if (((s % sizeof (struct lease)) != 0) ||
((s / sizeof (struct lease)) != (n + 1))) {
strcpy (lowbuf, piaddr (low));
strcpy (highbuf, piaddr (high));
parse_warn (cfile, "%s-%s is a far too large address range.",
lowbuf, highbuf);
log_fatal ("Memory overflow.");
}
address_range = new_leases (n, MDL);
if (!address_range) {
strcpy (lowbuf, piaddr (low));
strcpy (highbuf, piaddr (high));