linux-kernel - [PATCH] checkpatch: Add control statement test to SINGLE_STATEMENT_DO_WHILE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 02 Aug 2012 08:26:53 -0700
From:	Joe Perches <joe@...ches.com>
To:	Schrober <franzschrober@...oo.de>,
	Andy Whitcroft <apw@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] checkpatch: Add control statement test to
 SINGLE_STATEMENT_DO_WHILE_MACRO

commit b13edf7ff2d ("checkpatch: add checks for do {} while (0) macro misuses")
added a test that is overly simplistic for single statement macros.

Macros that start with control tests should be enclosed
in a do {} while (0) loop.

Add the necessary control tests to the check.

Signed-off-by: Joe Perches <joe@...ches.com>
---
On Thu, 2012-08-02 at 15:20 +0100, Andy Whitcroft wrote:
> On Thu, Aug 02, 2012 at 10:00:04AM +0200, Schrober wrote:
> > Hi,

Hello and thanks for the report.

> > I think your check for SINGLE_STATEMENT_DO_WHILE_MACRO is wrong.

And you are correct.

> It does appear this check should not apply when a control statement is
> included.

The patch below is tested with:
$ cat t.c

#define bar_1(foo)				\
	if (foo)				\
		baz();				\

#define bar_2(foo)				\
do {						\
	if (foo)				\
		baz();				\
} while (0)

#define bar_3(foo)				\
do {						\
	baz();					\
} while (0)

#define bar_4(foo)				\
do {						\
	baz();					\
} while (0);

#define bar_5(foo)				\
do {						\
	while (foo)				\
		baz();				\
} while (0)

#define bar_6(foo)				\
do {						\
	switch (foo) {				\
	case 1:					\
		baz();				\
	}					\
} while (0)

$

So perhaps...

 scripts/checkpatch.pl |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 913d6bd..ca05ba2 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3016,7 +3016,8 @@ sub process {
 					$herectx .= raw_line($linenr, $n) . "\n";
 				}
 
-				if (($stmts =~ tr/;/;/) == 1) {
+				if (($stmts =~ tr/;/;/) == 1 &&
+				    $stmts !~ /^\s*(if|while|for|switch)\b/) {
 					WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
 					     "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
 				}


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/