#verbose on open bug2.file.tmp # Two bugs while updating a short Subject: header immediately before # a still virgin "append header" pointer record. # # Symptom: # # warning: <filename>: malformed pointer record value: <garbage> # # Cause: # # Failure to recognize the "append header" record while updating # a short message header # # Analysis: # # This happened while updating a header record that was followed by # the current "append header" record. The pointer could be the initial # "append header" record between message header and body, or it could # be a later version of that pointer somewhere in the heap. # # - Postfix considered the pointer record as any pointer record after # a header record. Thus, it decided that some portion of the pointer # record could be overwritten with the location of the new Subject: # header on the heap. Later "append header" operations would then # update old "append header" record and thus clobber part of the # pointer to the new Subject: header value. # # - While saving the "append header" pointer record value on the # heap, Postfix did not replace the still virgin "0" append header" # pointer record value by the actual location of the message body # content. upd_header 1 Subject hey! add_header foo foobar close