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charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Mailer: WebService/1.1.20826 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo Subject: Re: [musl] Invalid read of nl_arg in printf_core() Excerpts from Szabolcs Nagy's message of November 5, 2022 6:09 am: > * Markus Wichmann [2022-11-03 20:42:16 +0100]: >> Hi all, >>=20 >> reading some code today, I noticed undefined behavior in printf_core(). >> vfprintf() creates an array called nl_arg automatically and does not >> initialize it. That is fine, but it means that reads from each array >> member are undefined behavior until that member gets assigned a value. >=20 > an automatic storage object that was not initialized has indeterminate > value, so accessing it is not undefined behaviour. (unless the object > could have been declared with the register storage class) >=20 > so technically the code is correct (if int has no trap representations) > but i think the fix still makes sense: leaving unspecified values around > is error prone. N1570 J.2 [Undefined behavior]: 1 The behavior is undefined in the following circumstances: [ ... ] =E2=80=94 The value of an object with automatic storage duration is used wh= ile it is indeterminate (6.2.4, 6.7.9, 6.8).