Please review: [389 Project] #47707: 389 DS Server crashes and dies while handles paged searches from clients

[Noriko Hosoi]

https://fedorahosted.org/389/ticket/47707

https://fedorahosted.org/389/attachment/ticket/47707/0001-Ticket-47707-389-D...

Bug Description: If a simple paged search request was sent to the server
  and the request was abandoned, the paged result slot in the connection
  table was not properly released by setting NULL to pr_current_be.  Since
  the slot did not look available for the next request even though it was,
  the next request failed to get the valid slot number, and the initial slot
  number -1 failed to be replaced with the real slot number.  Until the fix
  for "Ticket #47623 fix memleak caused by 47347" was made, it overrode the
  allocated array's [-1] location, which usually stores the meta data of the
  allocated memory.  That crashed the server in the next realloc since the
  corrupted memory was passed to the function.

Fix Description: This patch cleans up the abandoned/cleaned up slot for
  reuse.  Also, more check not to break the meta data is added.

Special thanks to German Parente ([e-mail]) for providing the
  reproducer and analysing the crash.