From: Damien Robert <damien.olivier.robert@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Jeff King <peff@peff.net>,
git@vger.kernel.org, Derrick Stolee <dstolee@microsoft.com>,
William Baker <William.Baker@microsoft.com>
Subject: Re: [PATCH 1/1] midx.c: fix an integer overflow
Date: Sat, 29 Feb 2020 18:15:40 +0100 [thread overview]
Message-ID: <20200229154241.gxwb4u7l5u6iaveg@doriath> (raw)
In-Reply-To: <xmqqzhd2cup5.fsf@gitster-ct.c.googlers.com>
From Junio C Hamano, Fri 28 Feb 2020 at 12:39:50 (-0800) :
> "Count up while i+1 is smaller than..." looked extremely unnatural and
> it was hard to grok, at least to me. This
> for (i = 0; i < m->num_objects - 1; i++) {
>
> might have been more palatable, but yours is much better.
This is probably a question of taste. The
for (i = 0; i < m->num_objects - 1; i++) {
looks like someone who forgot to use <= instead of < to me (until the body
of the for explain that we are actually iterating over two consecutive
objects), while
for (i = 0; i + 1 < m->num_objects; i++) {
makes it clear that we are iterating over two objects (and has the
advantage of not overflowing :))
> > Though I almost wonder if we should be catching "m->num_objects == 0"
> > early and declaring the midx to be bogus (it's not _technically_ wrong,
> > but I'd have to suspect a bug in anything that generated a 0-object midx
> > file).
> That, too ;-)
Yeah I'll go for that solution in my reroll.
--
Damien Robert
http://www.normalesup.org/~robert/pro
next prev parent reply other threads:[~2020-02-29 17:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-28 16:24 [PATCH 1/1] midx.c: fix an integer overflow Damien Robert
2020-02-28 18:55 ` Jeff King
2020-02-28 20:39 ` Junio C Hamano
2020-02-29 17:15 ` Damien Robert [this message]
2020-02-29 15:38 ` Damien Robert
2020-03-12 17:35 ` [PATCH v2 " Damien Robert
2020-03-12 18:24 ` Damien Robert
2020-03-12 18:28 ` Derrick Stolee
2020-03-12 21:41 ` Damien Robert
2020-03-23 22:25 ` [PATCH v3 " Damien Robert
2020-03-24 6:01 ` Jeff King
2020-03-24 18:48 ` Junio C Hamano
2020-03-26 21:35 ` [PATCH v4 " Damien Robert
2020-03-26 23:27 ` Junio C Hamano
2020-03-28 22:23 ` Damien Robert
2020-03-28 23:51 ` Junio C Hamano
2020-03-28 22:18 ` [PATCH 1/1] midx.c: fix an integer underflow Damien Robert
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