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(ITS#4532) slapd might crash when using pre/postread control

Full_Name: Ralf Haferkamp
Version: RE23/HEAD
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

When processing the pre- and postread controls slapd does an internal search. If
this search fails for any reason slapd (with back-bdb/-hdb) might crash while
freeing the control's value. Note: For me with RE23 this internal search always
fails because the sizelimit isn't properly initialized (this part was already 
fixed in 1.282 of servers/slapd/result.c)

A fix for the rest is on the way to the CVS.