Description of problem:
Previously: https://bugzilla.redhat.com/show_bug.cgi?id=1952907

This issue is not fixed completely and can be triggered by supplying a malformed cookie, for example -E sync=rp/foo

Thread 14 "ns-slapd" received signal SIGSEGV, Segmentation fault.
0x00007f7802ba38d6 in __strcmp_evex () from target:/lib64/libc.so.6
(gdb) bt
#0  0x00007f7802ba38d6 in __strcmp_evex () at target:/lib64/libc.so.6
#1  0x00007f77fe926e9f in sync_cookie_isvalid (refcookie=0x7f77febfaba0, testcookie=0x7f77febfab80)
    at ldap/servers/plugins/sync/sync_util.c:796
#2  sync_cookie_isvalid (testcookie=0x7f77febfab80, refcookie=0x7f77febfaba0) at ldap/servers/plugins/sync/sync_util.c:789
#3  0x00007f77fe92aa7d in sync_srch_refresh_pre_search (pb=0x7f77feb9fd00) at ldap/servers/plugins/sync/sync_refresh.c:135
#4  0x00007f7802e297d9 in plugin_call_func
    (list=0x7f77fe9ed800, operation=operation@entry=403, pb=pb@entry=0x7f77feb9fd00, call_one=call_one@entry=0)
    at ldap/servers/slapd/plugin.c:2001
#5  0x00007f7802e299e6 in plugin_call_list (pb=0x7f77feb9fd00, operation=403, list=<optimized out>) at ldap/servers/slapd/plugin.c:1944
#6  plugin_call_plugins (pb=0x7f77feb9fd00, whichfunction=403) at ldap/servers/slapd/plugin.c:414
#7  0x00007f7802e222a9 in op_shared_search (pb=pb@entry=0x7f77feb9fd00, send_result=send_result@entry=1) at ldap/servers/slapd/opshared.c:586
#8  0x0000556eb3f0db14 in do_search (pb=<optimized out>) at ldap/servers/slapd/search.c:388
#9  0x0000556eb3efcb7f in connection_dispatch_operation (pb=0x7f77feb9fd00, op=<optimized out>, conn=<optimized out>)
    at ldap/servers/slapd/connection.c:659
#10 connection_threadmain () at ldap/servers/slapd/connection.c:1785
#11 0x00007f780290ec34 in _pt_root () at target:/lib64/libnspr4.so
#12 0x00007f7802b75802 in start_thread () at target:/lib64/libc.so.6
#13 0x00007f7802b15450 in clone3 () at target:/lib64/libc.so.6


Automated reproducer: https://github.com/389ds/389-ds-base/blob/main/dirsrvtests/tests/tickets/ticket48013_test.py

Version-Release number of selected component (if applicable):
389-ds-base-2.0.x+ (earliest I was able to test was 2.0.5).

How reproducible:
Deterministically 

Steps to Reproduce:
1. https://github.com/389ds/389-ds-base/blob/main/dirsrvtests/tests/tickets/ticket48013_test.py

Actual results:
Server crashes

Expected results:
Should return an error that the cookie is invalid and not crash.

Additional info:
Upstream ticket: https://github.com/389ds/389-ds-base/issues/4711#issuecomment-1205100979