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From: "roland.illig at gmx dot de" <sourceware-bugzilla@sourceware.org>
To: bzip2-devel@sourceware.org
Subject: [Bug bzip2/28283] New: undefined behavior for isdigit and isspace
Date: Fri, 27 Aug 2021 17:31:37 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28283

            Bug ID: 28283
           Summary: undefined behavior for isdigit and isspace
           Product: bzip2
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bzip2
          Assignee: nobody at sourceware dot org
          Reporter: roland.illig at gmx dot de
                CC: bzip2-devel at sourceware dot org
  Target Milestone: ---

The functions from <ctype.h> take an int as parameter. The value of this
parameter must "either be representable as an unsigned char or be the value=
 of
the macro EOF".

The functions addFlagsFromEnvVar and bzopen_or_bzdopen wrongly cast the
argument to Int32, the correct type is UChar. After a direct cast to Int32,=
 the
argument may still be negative, which makes that cast wrong.

--=20
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