pull up r23608 from trunk

pull up r23608 from trunk

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 r23608 | epeisach | 2010-01-07 20:51:19 -0500 (Thu, 07 Jan 2010) | 23 lines

 subject: krb5int_derive_key results in cache with uninitialized values

 krb5int_derive_key creates a temporary keyblock to add to the derived cache.
 krb5_k_free_key will iterate over the derived keys and for ones with cache will
 lookup the enctype for the key_cleanup handler.

 Unfortunatly, there isn't a keyblock init function that does not allocate the
 keyblock - as I suspect this problem will appear in other places.

 The valgrind log of this problem is:

 ==7281== Conditional jump or move depends on uninitialised value(s)
 ==7281==    at 0x40E9AE8: find_enctype (etypes.h:81)
 ==7281==    by 0x40E9C96: krb5_k_free_key (key.c:91)
 ==7281==    by 0x40E9C52: krb5_k_free_key (key.c:86)
 ==7281==    by 0x40EBB00: krb5_c_prf (prf.c:87)
 ==7281==    by 0x40E7B1B: prf_plus (cf2.c:77)
 ==7281==    by 0x40E7CE6: krb5_c_fx_cf2_simple (cf2.c:125)
 ==7281==    by 0x804899C: main (t_cf2.c:70)
 ==7281==

 with memory leaks.

ticket: 6629
version_fixed: 1.8
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-8@23626 dc483132-0cff-0310-8789-dd5450dbe970