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(ITS#6233) print_deref assertion if no deref attributes returned

Full_Name: Rich Megginson
Version: 2.4.17+ (current HEAD)
OS: Fedora
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

I am testing the LDAP Dereference feature specified here -

I am getting an assertion in common.c at line 2077:
2074:		ptr = lutil_strncopy( ptr, dr->derefVal.bv_val, dr->derefVal.bv_len );
2075:		*ptr++ = '\n';
2076:		*ptr++ = '\0';
2077:		assert( ptr <= buf + len );

		tool_write_ldif( LDIF_PUT_COMMENT, NULL, buf, ptr - buf);

In my test, ptr is one greater than buf + len.  It appears that len does not
take into consideration the addition of the trailing \0 at line 2076.  My test
is looking for a dereference attribute which does not have any values, so that
the attrVals in the control response is empty.  If there are values to return in
attrVals, the assertion is not triggered.