[Bug libc/18873] New: posix_fallocate overflow check ineffective

["eggert at gnu dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18873

            Bug ID: 18873
           Summary: posix_fallocate overflow check ineffective
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: eggert at gnu dot org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 8554
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8554&action=edit
Fix broken overflow check in posix_fallocate

A Coverity scan found typos in the recent changes to posix_fallocate that
render the overflow check ineffective.  GCC no doubt just optimizes it away. 
Proposed patch attached.

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