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From: Derrick Stolee <stolee@gmail.com>
To: Jeff King <peff@peff.net>, git@vger.kernel.org
Cc: Yiyuan guo <yguoaz@gmail.com>
Subject: Re: [PATCH 5/5] pack-objects: clamp negative depth to 0
Date: Mon, 3 May 2021 08:11:45 -0400	[thread overview]
Message-ID: <dd080fd4-00cc-0e53-2cbd-30871c598b4d@gmail.com> (raw)
In-Reply-To: <YI1f8jKReuE3LXVH@coredump.intra.peff.net>

On 5/1/2021 10:04 AM, Jeff King wrote:
> A negative delta depth makes no sense, and the code is not prepared to
> handle it. If passed "--depth=-1" on the command line, then this line
> from break_delta_chains():
> 
> 	cur->depth = (total_depth--) % (depth + 1);
> 
> triggers a divide-by-zero. This is undefined behavior according to the C
> standard, but on POSIX systems results in SIGFPE killing the process.
> This is certainly one way to inform the use that the command was
> invalid, but it's a bit friendlier to just treat it as "don't allow any
> deltas", which we already do for --depth=0.

Makes sense to me. This whole series LGTM.

Thanks,
-Stolee

      reply	other threads:[~2021-05-03 12:11 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-01 14:02 [PATCH 0/5] pack-objects: better handling of negative options Jeff King
2021-05-01 14:02 ` [PATCH 1/5] t5300: modernize basic tests Jeff King
2021-05-03  5:27   ` Junio C Hamano
2021-05-03 14:53     ` Jeff King
2021-05-01 14:03 ` [PATCH 2/5] t5300: check that we produced expected number of deltas Jeff King
2021-05-01 14:03 ` [PATCH 3/5] pack-objects: clamp negative window size to 0 Jeff King
2021-05-03 12:10   ` Derrick Stolee
2021-05-03 14:55     ` Jeff King
2021-05-04 18:47       ` René Scharfe
2021-05-04 21:38         ` Jeff King
2021-05-05 11:53         ` Ævar Arnfjörð Bjarmason
2021-05-05 16:19           ` René Scharfe
2021-05-01 14:04 ` [PATCH 4/5] t5316: check behavior of pack-objects --depth=0 Jeff King
2021-05-01 14:04 ` [PATCH 5/5] pack-objects: clamp negative depth to 0 Jeff King
2021-05-03 12:11   ` Derrick Stolee [this message]

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