From: Eric Wong <e@80x24.org>
To: Jeff King <peff@peff.net>
Cc: Junio C Hamano <gitster@pobox.com>, git@vger.kernel.org
Subject: Re: [PATCH 2/2] am: plug FILE * leak in split_mail_conv()
Date: Thu, 12 May 2016 07:59:39 +0000 [thread overview]
Message-ID: <20160512075939.GA31343@dcvr.yhbt.net> (raw)
In-Reply-To: <20160512044730.GA5436@sigill.intra.peff.net>
Jeff King <peff@peff.net> wrote:
> On Wed, May 11, 2016 at 04:35:46PM -0700, Junio C Hamano wrote:
> > +++ b/builtin/am.c
> > @@ -761,9 +761,11 @@ static int split_mail_conv(mail_conv_fn fn, struct am_state *state,
> > mail = mkpath("%s/%0*d", state->dir, state->prec, i + 1);
> >
> > out = fopen(mail, "w");
> > - if (!out)
> > + if (!out) {
> > + fclose(in);
> > return error(_("could not open '%s' for writing: %s"),
> > mail, strerror(errno));
> > + }
>
> Presumably `fclose` doesn't ever overwrite errno in practice, but I
> guess it could in theory.
I think both patches in this series would benefit from capturing
errno before cleanup. `fclose` can call `free`, and `free` could
do any manner of things such as calling `madvise` with a flag
not implemented in the running kernel, or failing an optional
trylock without being fatal.
There's lots of non-standard malloc implementations out there :)
So I'm not sure if there's ever a guarantee that a non-error
function call preserves `errno`.
next prev parent reply other threads:[~2016-05-12 7:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-11 23:35 [PATCH 1/2] am: plug small memory leak when split_mail_stgit_series() fails Junio C Hamano
2016-05-11 23:35 ` [PATCH 2/2] am: plug FILE * leak in split_mail_conv() Junio C Hamano
2016-05-12 4:47 ` Jeff King
2016-05-12 5:23 ` Mikael Magnusson
2016-05-12 5:29 ` Jeff King
2016-05-12 7:59 ` Eric Wong [this message]
2016-05-12 8:03 ` Jeff King
2016-05-12 15:59 ` Junio C Hamano
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