linux-kernel - Re: [PATCH] checkpatch: fix uninitialized var when run with --no-tree

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Date:   Tue, 8 Nov 2016 15:10:40 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Brian Norris <computersforpeace@...il.com>
Cc:     Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        SF Markus Elfring <elfring@...rs.sourceforge.net>,
        Jerome Forissier <jerome.forissier@...aro.org>
Subject: Re: [PATCH] checkpatch: fix uninitialized var when run with
 --no-tree

On Fri, 28 Oct 2016 19:36:09 -0700 Brian Norris <computersforpeace@...il.com> wrote:

> On Fri, Oct 28, 2016 at 07:26:31PM -0700, Brian Norris wrote:
> > From: Brian Norris <computersforpeace@...il.com>
> > 
> > If checkpatch.pl gets copied out of the tree, --no-tree shouldn't start
> > complaining:
> > 
> >   Use of uninitialized value $root in concatenation (.) or string at
> >   /path/to/checkpatch.pl line 764.
> > 
> > Let's just give the safe answer instead -- don't warn about "obsolete"
> > files.
> > 
> > Fixes: 85b0ee18bbf8 ("checkpatch: see if modified files are marked obsolete in MAINTAINERS")
> > Signed-off-by: Brian Norris <computersforpeace@...il.com>
> > ---
> > This is a 4.9-rc1 regression
> > 
> >  scripts/checkpatch.pl | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > index a8368d1c4348..c8cd643dbc6f 100755
> > --- a/scripts/checkpatch.pl
> > +++ b/scripts/checkpatch.pl
> > @@ -761,6 +761,8 @@ sub seed_camelcase_file {
> >  sub is_maintained_obsolete {
> >  	my ($filename) = @_;
> >  
> > +	return 0 if (!$tree);
> 
> Actually, I'm torn on this. It looks really odd to check for !$tree
> here, but it's the only supported case where $root shouldn't be defined.
> Maybe (!defined $root) is a better test? (Sorry, I did a double-take on
> this after I sent it.)
> 
> Both would be equally correct, but I suppose the latter would be
> clearer. I'll send v2.

I already have the below.  Good enough?

From: Jerome Forissier <jerome.forissier@...aro.org>
Subject: checkpatch: don't try to get maintained status when --no-tree is given

Fixes the following warning:
Use of uninitialized value $root in concatenation (.) or string at /path/to/checkpatch.pl line 764.

Link: http://lkml.kernel.org/r/1476719709-16668-1-git-send-email-jerome.forissier@linaro.org
Signed-off-by: Jerome Forissier <jerome.forissier@...aro.org>
Acked-by: Joe Perches <joe@...ches.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 scripts/checkpatch.pl |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN scripts/checkpatch.pl~checkpatch-dont-try-to-get-maintained-status-when-no-tree-is-given scripts/checkpatch.pl
--- a/scripts/checkpatch.pl~checkpatch-dont-try-to-get-maintained-status-when-no-tree-is-given
+++ a/scripts/checkpatch.pl
@@ -761,7 +761,7 @@ sub seed_camelcase_file {
 sub is_maintained_obsolete {
 	my ($filename) = @_;
 
-	return 0 if (!(-e "$root/scripts/get_maintainer.pl"));
+	return 0 if (!$tree || !(-e "$root/scripts/get_maintainer.pl"));
 
 	my $status = `perl $root/scripts/get_maintainer.pl --status --nom --nol --nogit --nogit-fallback -f $filename 2>&1`;
 
_