svn rev #23626: branches/krb5-1-8/src/lib/crypto/krb/dk/

[tlyu@MIT.EDU]

http://src.mit.edu/fisheye/changelog/krb5/?cs=23626
Commit By: tlyu
Log Message:
ticket: 6629
version_fixed: 1.8
status: resolved

pull up r23608 from trunk

 ------------------------------------------------------------------------
 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.


Changed Files:
U   branches/krb5-1-8/src/lib/crypto/krb/dk/derive.c
Modified: branches/krb5-1-8/src/lib/crypto/krb/dk/derive.c
===================================================================
--- branches/krb5-1-8/src/lib/crypto/krb/dk/derive.c	2010-01-11 15:19:42 UTC (rev 23625)
+++ branches/krb5-1-8/src/lib/crypto/krb/dk/derive.c	2010-01-11 21:44:13 UTC (rev 23626)
@@ -183,6 +183,10 @@
     /* Derive into a temporary keyblock. */
     keyblock.length = enc->keylength;
     keyblock.contents = malloc(keyblock.length);
+    /* Set the enctype as the krb5_k_free_key will iterate over list
+       or derived keys and invoke krb5_k_free_key which will lookup
+       the enctype for key_cleanup handler */
+    keyblock.enctype = inkey->keyblock.enctype;
     if (keyblock.contents == NULL)
         return ENOMEM;
     ret = krb5int_derive_keyblock(enc, inkey, &keyblock, in_constant);