Date: Tue, 21 May 2002 13:07:17 -0500 From: "Jacques A. Vidrine" <nectar@FreeBSD.ORG> To: Mike Tancsa <mike@sentex.net> Cc: stable@FreeBSD.ORG Subject: Re: New resolver bug ? Message-ID: <20020521180717.GA11790@madman.nectar.cc> In-Reply-To: <5.1.0.14.0.20020521120759.054f8438@192.168.0.12> References: <5.1.0.14.0.20020521120759.054f8438@192.168.0.12>
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On Tue, May 21, 2002 at 12:10:40PM -0400, Mike Tancsa wrote:
> Granted, its a rather strange entry, but why does
>
> backup2# nslookup -type=a mail.spicer.com
> Server: ns2.sentex.ca
> Address: 199.212.134.2
>
> nslookup in free(): warning: junk pointer, too low to make sense
> Name: mail.spicer.com
> Address: 216.16.235.172
OK, it appears you are hitting a bug was introduced in 8.3.2-T1B
nslookup/getinfo.c where a static data structure is free'd. You can
use the following patch:
Index: contrib/bind/bin/nslookup/getinfo.c
===================================================================
RCS file: /home/ncvs/src/contrib/bind/bin/nslookup/getinfo.c,v
retrieving revision 1.3.2.5
diff -u -r1.3.2.5 getinfo.c
--- contrib/bind/bin/nslookup/getinfo.c 2002/05/15 19:51:22 1.3.2.5
+++ contrib/bind/bin/nslookup/getinfo.c 2002/05/21 17:48:47
@@ -420,10 +420,8 @@
!memcmp(hostPtr->addrList[l]->addr, addr_list[i],
addr_len[i]))
break;
- if (l < k) {
- free(addr_list[i]);
+ if (l < k)
continue;
- }
hostPtr->addrList[k] = (AddrInfo*)Calloc(1, sizeof(AddrInfo));
hostPtr->addrList[k]->addr = Calloc(1, addr_len[i]);
hostPtr->addrList[k]->addrType = addr_type[i];
I've reported the bug, and once it is confirmed I will apply the fix
to -CURRENT and -STABLE (hopefully in time for release).
Hmm, that fails to explain your `telnet' issue, though ...
Cheers,
--
Jacques A. Vidrine <n@nectar.cc> http://www.nectar.cc/
NTT/Verio SME . FreeBSD UNIX . Heimdal Kerberos
jvidrine@verio.net . nectar@FreeBSD.org . nectar@kth.se
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