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Description of problem:

new issue in ldap_chain_op:


Program terminated with signal 11, Segmentation fault.
#0  ldap_chain_op (op=op@entry=0x7fcbb00008e0, rs=rs@entry=0x7fcba8ffbb00, 
    op_f=0x7fcbe39e2fe0 <ldap_back_search>, ref=ref@entry=0x0, 
    depth=depth@entry=0) at chain.c:422
422		for ( ; !BER_BVISNULL( ref ); ref++ ) {


(gdb) list
417		(void)chaining_control_add( lc, op, &ctrls );
418	#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
419	
420		li.li_bvuri = bvuri;
421		first_rc = -1;
422		for ( ; !BER_BVISNULL( ref ); ref++ ) {
423			SlapReply	rs2 = { 0 };
424			LDAPURLDesc	*srv = NULL;
425			req_search_s	save_oq_search = op->oq_search,
426					tmp_oq_search = { 0 };
(gdb) 


ref is NULL.

Clearly: 

#define BER_BVISNULL(bv)	((bv)->bv_val == NULL)

So, BER_BVISNULL( ref ) is crashing the server since "ref" is not checked before being accessed.




Version-Release number of selected component (if applicable):  openldap-servers-2.4.44-5.el7.x86_64