I am on Fedora 13 x64-64 running with samba-client-3.6.13. When I issue the following command:

$ rpcclient -U Administrator%<pass> -c 'netshareenum 502'<FQDN of server>
...
SACL
Segmentation fault (core dumped)

The problem is the "totalentries" count is larger than the actual size of the array of SHARE_502_INFO structures. This condition causes rpcclient to shoot past the end of the array and SEGV.

A small snippet of gdb for illustration purposes notes while in cmd_srvsvc_net_share_enum_int (source3/rpcclient/cmd_srvsvc.c):

(gdb) p *info_ctr.ctr.ctr502
$9 = {
  count = 34, 
  array = 0x67a140
}
(gdb) p totalentries 
$10 = 35

The "count" needs to be used for the loop that displays the results, not total entries.