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Message-ID: <3e32e97858d5bf9d88cc03136d7abc7af2dd7f30.camel@perches.com>
Date: Sun, 05 Mar 2023 16:05:18 -0800
From: Joe Perches <joe@...ches.com>
To: Alexander Potapenko <glider@...gle.com>
Cc: apw@...onical.com, dwaipayanray1@...il.com,
Lukas Bulwahn <lukas.bulwahn@...il.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: Infinite loop in checkpatch.pl
On Fri, 2023-03-03 at 21:53 +0100, Alexander Potapenko wrote:
> On Fri, Mar 3, 2023 at 5:53 PM Joe Perches <joe@...ches.com> wrote:
> >
> > On Fri, 2023-03-03 at 15:28 +0100, Alexander Potapenko wrote:
> > > Hi folks,
> > >
> > > I've noticed that checkpatch.pl chokes on the following file (also attached):
> > >
> > > ==================================
> > > $ cat test-checkpatch.txt
> > > diff --git a/mm/kmsan/kmsan_test.c b/mm/kmsan/kmsan_test.c
> > > @@ -504,6 +504,25 @@ static void
> > > test_memcpy_aligned_to_unaligned2(struct kunit *test)
> > > + EXPECTATION_NO_REPORT(expect); \
> > > + volatile uint##size##_t uninit; \
> >
> > checkpatch isn't a syntax complete c parser. Don't expect to be.
>
> That's understandable, and I sure don't. But as a user I expect it to
> not loop infinitely, and I think that's also reasonable.
> The example I gave is not a randomly generated code snippet, but an
> excerpt from a valid patch that I sent earlier today:
> https://lore.kernel.org/lkml/20230303141433.3422671-4-glider@google.com/,
> which checkpatch cannot process.
I think this may be appropriate instead. Andy W?
---
scripts/checkpatch.pl | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index bd44d12965c98..3328fb9f6d048 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -999,7 +999,9 @@ if (defined($typedefsfile)) {
}
sub build_types {
- my $mods = "(?x: \n" . join("|\n ", (@modifierList, @modifierListFile)) . "\n)";
+ my $mods = "(?x: \n" . join("|\n ", @modifierList);
+ $mods .= "|(?^: \n" . join("|\n ", @modifierListFile) . "\n)" if ($#modifierListFile >= 0);
+ $mods .= ')';
my $all = "(?x: \n" . join("|\n ", (@typeList, @typeListFile)) . "\n)";
my $Misordered = "(?x: \n" . join("|\n ", @typeListMisordered) . "\n)";
my $allWithAttr = "(?x: \n" . join("|\n ", @typeListWithAttr) . "\n)";
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