1 Problem description:

     2 smbd dump core in libkrb5-samba4.so.26.0.0:krb5_storage_free if arg. sp is NULL

     3 

     4 Issue hits Samba using  Heimdal krb5 code only.

     5 

     6 Promoted into upstream as Samba bug:

     7 https://bugzilla.samba.org/show_bug.cgi?id=12505

     8 

     9 --- a/source4/heimdal/lib/krb5/store.c	2017-01-09 16:03:14.204115997 -0800

    10 +++ b/source4/heimdal/lib/krb5/store.c	2017-01-09 16:06:04.835337808 -0800

    11 @@ -270,6 +270,7 @@

    12  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL

    13  krb5_storage_free(krb5_storage *sp)

    14  {

    15 +    if(sp == NULL) return -1;

    16      if(sp->free)

    17  	(*sp->free)(sp);

    18      free(sp->data);