OpenSSH 3.2.2p1 sshd: fatal: xfree: NULL pointer given as argument

Phil Howard phil-openssh-unix-dev at ipal.net
Sun May 19 19:04:31 EST 2002 

On Sat, May 18, 2002 at 03:56:44PM -0700, Kevin Steves wrote:

| On Sat, May 18, 2002 at 07:53:50AM -0500, Phil Howard wrote:
| > debug1: dh_gen_key: priv key bits set: 194/384
| > debug1: bits set: 1047/2049
| > debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
| > debug1: bits set: 1031/2049
| > xfree: NULL pointer given as argument
| > debug1: Calling cleanup 0x806b00c(0x0)
| 
| Can you narrow the config down a bit in terms of what may cause this,
| or get a stack trace?

It's the config I've been using for ages.  What's to narrow down?
If you have a different config you would like me to try, I can do
that.  Or should I take each line out one at a time?

What is the means to run this to get a stack trace?

I just discovered that when the 3.2.2p1 client connects to a 3.1p1
server, the client dies with the same error message:

xfree: NULL pointer given as argument

I don't know if it would have done that with the 3.2.2p1 server had
the server not died first.  All my key files were built in earlier
versions of OpenSSH (most even before 3.1p1).

Here is the full debug level 3 of the client running (209 lines):

=============================================================================
OpenSSH_3.2.2p1, SSH protocols 1.5/2.0, OpenSSL 0x0090603f
debug1: Reading configuration data /home/phil/.ssh/config
debug1: Applying options for *
debug3: cipher ok: 3des-cbc [3des-cbc,blowfish-cbc]
debug3: cipher ok: blowfish-cbc [3des-cbc,blowfish-cbc]
debug3: ciphers ok: [3des-cbc,blowfish-cbc]
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Rhosts Authentication disabled, originating port will not be trusted.
debug1: restore_uid
debug1: ssh_connect: getuid 600 geteuid 0 anon 1
debug1: Connecting to hamal [209.102.192.71] port 22.
debug1: temporarily_use_uid: 600/600 (e=0)
debug1: restore_uid
debug1: temporarily_use_uid: 600/600 (e=0)
debug1: restore_uid
debug1: Connection established.
debug3: Not a RSA1 key file /home/phil/.ssh/id0.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: no key found
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: no key found
debug1: identity file /home/phil/.ssh/id0 type -1
debug3: Not a RSA1 key file /home/phil/.ssh/id1.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: no key found
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: no key found
debug1: identity file /home/phil/.ssh/id1 type -1
debug3: Not a RSA1 key file /home/phil/.ssh/id2.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: no key found
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: no key found
debug1: identity file /home/phil/.ssh/id2 type -1
debug3: Not a RSA1 key file /home/phil/.ssh/id3.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: no key found
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: no key found
debug1: identity file /home/phil/.ssh/id3 type -1
debug3: Not a RSA1 key file /home/phil/.ssh/id4.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: no key found
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: no key found
debug1: identity file /home/phil/.ssh/id4 type -1
debug3: Not a RSA1 key file /home/phil/.ssh/id5.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: no key found
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: no key found
debug1: identity file /home/phil/.ssh/id5 type -1
debug3: Not a RSA1 key file /home/phil/.ssh/id6.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: no key found
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug3: key_read: no space
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: no key found
debug1: identity file /home/phil/.ssh/id6 type -1
debug1: identity file /home/phil/.ssh/id7 type -1
debug1: identity file /home/phil/.ssh/id8 type -1
debug1: identity file /home/phil/.ssh/id9 type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_3.1p1
debug1: match: OpenSSH_3.1p1 pat OpenSSH_2.*,OpenSSH_3.0*,OpenSSH_3.1*
Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.2.2p1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: 3des-cbc,blowfish-cbc
debug2: kex_parse_kexinit: 3des-cbc,blowfish-cbc
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: zlib
debug2: kex_parse_kexinit: zlib
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-dss,ssh-rsa
debug2: kex_parse_kexinit: aes256-cbc,aes192-cbc,aes128-cbc,blowfish-cbc,3des-cbc
debug2: kex_parse_kexinit: aes256-cbc,aes192-cbc,aes128-cbc,blowfish-cbc,3des-cbc
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: mac_init: found hmac-md5
debug1: kex: server->client 3des-cbc hmac-md5 zlib
debug2: mac_init: found hmac-md5
debug1: kex: client->server 3des-cbc hmac-md5 zlib
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: dh_gen_key: priv key bits set: 193/384
debug1: bits set: 515/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/phil/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug3: check_host_in_hostfile: filename /home/phil/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug1: Host 'hamal' is known and matches the RSA host key.
debug1: Found key in /home/phil/.ssh/known_hosts:1
debug1: bits set: 515/1024
xfree: NULL pointer given as argument
debug1: Calling cleanup 0x8063b4c(0x0)
=============================================================================

-- 
-----------------------------------------------------------------
| Phil Howard - KA9WGN |   Dallas   | http://linuxhomepage.com/ |
| phil-nospam at ipal.net | Texas, USA | http://phil.ipal.org/     |
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