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From: "terra at gnome dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/112569] New: libstdc++-v3/include/ranges:1456:
 missing check for self-assignment
Date: Thu, 16 Nov 2023 13:03:24 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 13.1.0
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X-Bugzilla-Who: terra at gnome dot org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112569

            Bug ID: 112569
           Summary: libstdc++-v3/include/ranges:1456: missing check for
                    self-assignment
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: terra at gnome dot org
  Target Milestone: ---

The move assignment operator for _CachedPosition does not check for
self-assignment and it is not obviously safe for other reasons.=20
Self-assignment will overwrite _M_offset with the value -1.

It's an internal class.  I have no idea if this has any externally visible
consequences.=