kadmind frees invalid pointer [MITKRB5-SA-2011-004 CVE-2011-0285]

kadmind frees invalid pointer [MITKRB5-SA-2011-004 CVE-2011-0285]

back-port r24878 for 1.7-branch

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 r24878 | tlyu | 2011-04-13 14:43:37 -0400 (Wed, 13 Apr 2011) | 11 lines

 ticket: 6899
 tags: pullup
 target_version: 1.9.1

 Fix the sole case in process_chpw_request() where a return could occur
 without allocating the data pointer in the response.  This prevents a
 later free() of an invalid pointer in kill_tcp_or_rpc_connection().

 Also initialize rep->data to NULL in process_chpw_request() and clean
 up *response in dispatch() as an additional precaution.

ticket: 6901
status: resolved
version_fixed: 1.7.2

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-7@24881 dc483132-0cff-0310-8789-dd5450dbe970