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From: "ville.voutilainen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/64315] New: num_put misbehaves if the C library doesn't support floats
Date: Mon, 15 Dec 2014 13:45:00 -0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 5.0
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X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: ville.voutilainen at gmail dot com
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64315

            Bug ID: 64315
           Summary: num_put misbehaves if the C library doesn't support
                    floats
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ville.voutilainen at gmail dot com

In num_put::_M_insert_float, __convert_from_v can fail, leading into a __widen
being called with a negative size. This may happen with a C library that has a
sprintf that refuses to support floats and returns -1 when a float is used with
it.