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Subject: [Bug 219000] [patch] Integer underflow in efipart_realstrategy when
 I/O starts after end of disk
Date: Sat, 01 Jul 2017 20:25:57 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219000

--- Comment #2 from commit-hook@freebsd.org ---
A commit references this bug:

Author: allanjude
Date: Sat Jul  1 20:25:22 UTC 2017
New revision: 320553
URL: https://svnweb.freebsd.org/changeset/base/320553

Log:
  Integer underflow in efipart_realstrategy when I/O starts after end of di=
sk

  This fixes an integer underflow in efipart_realstrategy, which causes
  crashes when an I/O operation's start point is after the end of the disk.
  This can happen when trying to detect filesystems on very small disks.
  This can occur if a BIOS freebsd-boot partition exists on a system when t=
he
  EFI loader is being used.

  PR:           219000
  Submitted by: Eric McCorkle <eric@metricspace.net>
  Reviewed by:  cem (previous version), tsoome (previous version)
  MFC after:    1 week
  Differential Revision:        https://reviews.freebsd.org/D10559

Changes:
  head/sys/boot/efi/libefi/efipart.c

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