krb5 commit: Fix unlikely null dereference in TGS client code

[Greg Hudson]

https://github.com/krb5/krb5/commit/81e503c09ad9aef4a0afc6bf66a0269cde2151f3
commit 81e503c09ad9aef4a0afc6bf66a0269cde2151f3
Author: Neng Xue <xnsuda at yahoo.com>
Date:   Mon Jun 30 14:04:56 2014 -0700

    Fix unlikely null dereference in TGS client code
    
    If krb5_get_tgs_ktypes fails (due to an out-of-memory condition or an
    error re-reading the profile), k5_make_tgs_req will dereference a null
    pointer.  Check the return value before dereferencing defenctypes.
    
    [ghudson at mit.edu: clarified commit message]
    
    ticket: 7952 (new)
    target_version: 1.12.2
    tags: pullup

 src/lib/krb5/krb/send_tgs.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/lib/krb5/krb/send_tgs.c b/src/lib/krb5/krb/send_tgs.c
index cd56366..f6fdf68 100644
--- a/src/lib/krb5/krb/send_tgs.c
+++ b/src/lib/krb5/krb/send_tgs.c
@@ -198,7 +198,9 @@ k5_make_tgs_req(krb5_context context,
         req.nktypes = 1;
     } else {
         /* Get the default TGS enctypes. */
-        krb5_get_tgs_ktypes(context, desired->server, &defenctypes);
+        ret = krb5_get_tgs_ktypes(context, desired->server, &defenctypes);
+        if (ret)
+            goto cleanup;
         for (count = 0; defenctypes[count]; count++);
         req.ktype = defenctypes;
         req.nktypes = count;