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From: "eggert at cs dot ucla.edu" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug time/28338] New: undefined behavior in __tzfile_compute with
 oddball TZif file
Date: Tue, 14 Sep 2021 05:47:12 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28338

            Bug ID: 28338
           Summary: undefined behavior in __tzfile_compute with oddball
                    TZif file
           Product: glibc
           Version: 2.34
            Status: NEW
          Severity: normal
          Priority: P2
         Component: time
          Assignee: unassigned at sourceware dot org
          Reporter: eggert at cs dot ucla.edu
  Target Milestone: ---

Created attachment 13665
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D13665&action=3Ded=
it
Fix access before array start in __tzfile_compute.

__tzfile_compute reads before the beginning of an array when given a
weird-but-valid TZif file and a localtime request exactly matching a negati=
ve
leap second. Patch attached. The bug in the unpatched version occurs when (=
i =3D=3D
0 && leaps[i].change <=3D 0); the code goes on to access leaps[-1] which is=
 out
of the array bounds.

--=20
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