From: ZheNing Hu <adlternative@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: ZheNing Hu via GitGitGadget <gitgitgadget@gmail.com>,
Git List <git@vger.kernel.org>,
Christian Couder <christian.couder@gmail.com>,
Hariom Verma <hariom18599@gmail.com>,
Karthik Nayak <karthik.188@gmail.com>,
Felipe Contreras <felipe.contreras@gmail.com>,
Bagas Sanjaya <bagasdotme@gmail.com>, Jeff King <peff@peff.net>
Subject: Re: [PATCH 1/2] [GSOC] ref-filter: add %(raw) atom
Date: Sun, 30 May 2021 16:11:52 +0800 [thread overview]
Message-ID: <CAOLTT8QAS5AyUE-9hR7v1bfYdAEf=VJiPZukGMJED+F_4Jt_zg@mail.gmail.com> (raw)
In-Reply-To: <CAOLTT8SLLgZnF0SV2FPPBJkB=ybeh8mamTPqc-M6CXQeepooOQ@mail.gmail.com>
ZheNing Hu <adlternative@gmail.com> 于2021年5月28日周五 下午11:04写道:
>
> > Can the change in this commit violate the invariant that
> > if_then_else->str cannot be NULL, which seems to have been the case
> > forever as we see an unchecked strcmp() done in the original?
> >
> > If so, perhaps you can check the condition upfront, where you
> > compute str_len above, e.g.
> >
> > if (!if_then_else->str) {
> > if (if_then_else->cmp_status == COMPARE_EQUAL ||
> > if_then_else->cmp_status == COMPARE_UNEQUAL)
> > BUG(...);
> > } else
> > str_len = strlen(...);
> >
> > If not, then I do not see the point of adding this (and later) check
> > with BUG to this code.
> >
> > Or is the invariant that .str must not be NULL could have been
> > violated without this patch (i.e. the original was buggy in running
> > strcmp() on .str without checking)? If so, please make it a separate
> > preliminary change to add such an assert.
> >
>
> The BUG() here actually acts as an "assert()". ".str must not be NULL" is
> right, it point to "xxx" in "%(if:equals=xxx)", so it seems that these BUG()
> are somewhat redundant, I will remove them.
>
Correct the error: If the atom is "%(if)" instread of
"%(if:equals=xxx)", .str will be NULL.
Without assert() or BUG() is ok, but clang-tidy will give a warning:
"Null pointer
passed to 1st parameter expecting 'nonnull'"
--
ZheNing Hu
next prev parent reply other threads:[~2021-05-30 8:12 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-27 14:43 [PATCH 0/2] [GSOC] ref-filter: add %(raw) atom ZheNing Hu via GitGitGadget
2021-05-27 14:43 ` [PATCH 1/2] " ZheNing Hu via GitGitGadget
2021-05-27 16:36 ` Felipe Contreras
2021-05-28 13:02 ` ZheNing Hu
2021-05-28 16:30 ` Felipe Contreras
2021-05-30 5:37 ` ZheNing Hu
2021-05-29 13:23 ` Phillip Wood
2021-05-29 15:24 ` Felipe Contreras
2021-05-29 17:23 ` Phillip Wood
2021-05-30 6:29 ` ZheNing Hu
2021-05-30 13:05 ` Phillip Wood
2021-05-31 14:15 ` ZheNing Hu
2021-05-31 15:35 ` Felipe Contreras
2021-05-30 6:26 ` ZheNing Hu
2021-05-30 13:02 ` Phillip Wood
2021-05-28 3:03 ` Junio C Hamano
2021-05-28 15:04 ` ZheNing Hu
2021-05-28 16:38 ` Felipe Contreras
2021-05-30 8:11 ` ZheNing Hu [this message]
2021-05-27 14:43 ` [PATCH 2/2] [GSOC] ref-filter: add %(header) atom ZheNing Hu via GitGitGadget
2021-05-27 16:37 ` Felipe Contreras
2021-05-28 3:06 ` Junio C Hamano
2021-05-28 4:36 ` Junio C Hamano
2021-05-28 15:19 ` ZheNing Hu
2021-05-27 15:39 ` [PATCH 0/2] [GSOC] ref-filter: add %(raw) atom Felipe Contreras
2021-05-30 13:01 ` [PATCH v2 " ZheNing Hu via GitGitGadget
2021-05-30 13:01 ` [PATCH v2 1/2] [GSOC] ref-filter: add obj-type check in grab contents ZheNing Hu via GitGitGadget
2021-05-31 5:34 ` Junio C Hamano
2021-05-30 13:01 ` [PATCH v2 2/2] [GSOC] ref-filter: add %(raw) atom ZheNing Hu via GitGitGadget
2021-05-31 0:44 ` Junio C Hamano
2021-05-31 14:35 ` ZheNing Hu
2021-06-01 9:54 ` Junio C Hamano
2021-06-01 11:05 ` ZheNing Hu
2021-05-31 4:04 ` Junio C Hamano
2021-05-31 14:40 ` ZheNing Hu
2021-06-01 8:54 ` Junio C Hamano
2021-06-01 11:00 ` ZheNing Hu
2021-06-01 13:48 ` Johannes Schindelin
2021-05-31 4:10 ` Junio C Hamano
2021-05-31 15:41 ` Felipe Contreras
2021-06-01 10:37 ` ZheNing Hu
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