linux-kernel - [PATCH 02/11] checkpatch: check for common memset parameter issues against statments

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Message-Id: <1322494973-29225-3-git-send-email-apw@canonical.com>
Date:	Mon, 28 Nov 2011 15:42:44 +0000
From:	Andy Whitcroft <apw@...onical.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Joe Perches <joe@...ches.com>, linux-kernel@...r.kernel.org,
	Andy Whitcroft <apw@...onical.com>
Subject: [PATCH 02/11] checkpatch: check for common memset parameter issues against statments

Move the memset checks over to work against the statement.  Also add
checks for 0 and 1 used as lengths.  Generally these indicate badly
ordered parameters.

Signed-off-by: Andy Whitcroft <apw@...onical.com>
---
 scripts/checkpatch.pl |   28 ++++++++++++++++++++++------
 1 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index eac342d..e07c36a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3111,6 +3111,28 @@ sub process {
 			     "Avoid line continuations in quoted strings\n" . $herecurr);
 		}
 
+# Check for misused memsets
+		if (defined $stat && $stat =~ /\bmemset\s*\((.*)\)/s) {
+			my $args = $1;
+
+			# Flatten any parentheses and braces
+			while ($args =~ s/\([^\(\)]*\)/10/s ||
+			       $args =~ s/\{[^\{\}]*\}/10/s ||
+			       $args =~ s/\[[^\[\]]*\]/10/s)
+			{
+			}
+			# Extract the simplified arguments.
+			my ($ms_addr, $ms_val, $ms_size) =
+						split(/\s*,\s*/, $args);
+			if ($ms_size =~ /^(0x|)0$/i) {
+				ERROR("MEMSET",
+				      "memset size is 3rd argument, not the second.\n" . $herecurr);
+			} elsif ($ms_size =~ /^(0x|)1$/i) {
+				WARN("MEMSET",
+				     "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . $herecurr);
+			}
+		}
+
 # check for new externs in .c files.
 		if ($realfile =~ /\.c$/ && defined $stat &&
 		    $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
@@ -3282,12 +3304,6 @@ sub process {
 			WARN("EXPORTED_WORLD_WRITABLE",
 			     "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
 		}
-
-		# Check for memset with swapped arguments
-		if ($line =~ /memset.*\,(\ |)(0x|)0(\ |0|)\);/) {
-			ERROR("MEMSET",
-			      "memset size is 3rd argument, not the second.\n" . $herecurr);
-		}
 	}
 
 	# If we have no input at all, then there is nothing to report on
-- 
1.7.5.4

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