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(ITS#8027) ldapsearch -E deref=member: crashes slapd

Full_Name: Ryan Tandy
Version: master (7df548d), RE24 (2b14bbc)
OS: Debian unstable
Submission from: (NULL) (

If you use the deref control but leave the list of requested attributes empty,
slapd crashes.

ldapsearch [...] -E deref=member:

#0  0x0000000000516ef0 in deref_parseCtrl (op=0x7fffec000940, rs=0x7ffff57eeac0,
ctrl=0x7fffec001238) at deref.c:225
#1  0x000000000046a84d in slap_parse_ctrl (op=0x7fffec000940, rs=0x7ffff57eeac0,
control=0x7fffec001238, text=0x7ffff57eeae0)
    at controls.c:693
#2  0x000000000046b0f5 in get_ctrls2 (op=0x7fffec000940, rs=0x7ffff57eeac0,
sendres=1, ctag=160) at controls.c:886
#3  0x000000000046a8ff in get_ctrls (op=0x7fffec000940, rs=0x7ffff57eeac0,
sendres=1) at controls.c:723
#4  0x000000000042e94e in do_search (op=0x7fffec000940, rs=0x7ffff57eeac0) at
#5  0x000000000042bdf3 in connection_operation (ctx=0x7ffff57eebf0,
arg_v=0x7fffec000940) at connection.c:1134
#6  0x000000000042c3a3 in connection_read_thread (ctx=0x7ffff57eebf0, argv=0xb)
at connection.c:1280
#7  0x0000000000538938 in ldap_int_thread_pool_wrapper (xpool=0x892bc0) at
#8  0x00007ffff79b00a4 in start_thread (arg=0x7ffff57ef700) at
#9  0x00007ffff76e4ccd in clone () at

(line numbers are from master)

The ldapsearch manpage implies this probably isn't valid, but it still accepted
it. (FWIW, I tried it just to see whether it would return all attributes or
none.) I couldn't tell from draft-ldap-deref-00 whether an empty attr list is
considered a valid request.