From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id B78E73858C3A; Tue,  1 Mar 2022 05:01:38 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B78E73858C3A
From: "john.m.kenny at outlook dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug stdio/28932] New: scanf "%n" incorrectly requires int pointer,
 instead of size_t pointer
Date: Tue, 01 Mar 2022 05:01:38 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: stdio
X-Bugzilla-Version: unspecified
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: minor
X-Bugzilla-Who: john.m.kenny at outlook dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-28932-131@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: glibc-bugs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Glibc-bugs mailing list <glibc-bugs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/glibc-bugs/>
List-Help: <mailto:glibc-bugs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Tue, 01 Mar 2022 05:01:38 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D28932

            Bug ID: 28932
           Summary: scanf "%n" incorrectly requires int pointer, instead
                    of size_t pointer
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: john.m.kenny at outlook dot com
  Target Milestone: ---

The scanf function's conversion specifier "%n" requires the next pointer to=
 be
a pointer to an int. That int gets "the  number of characters consumed thus=
 far
from the input". However, an int may not be large enough to read the number=
 of
chars read.

Previous programmers have identified this issue and resolved it by using a
size_t. As evidence, the strlen(3) function returns a size_t and not an int.

The fix: make the require pointer for the "%n" conversion specifier a size_t
pointer instead of an int.

--=20
You are receiving this mail because:
You are on the CC list for the bug.=