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authorAndy Whitcroft <apw@canonical.com>2012-01-10 15:09:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 16:30:50 -0800
commit554e165cf32610ec9596a183fa1b54a5707fc3cb (patch)
tree027354f186b71c033929a5ecf8df80f131c9ce7b /scripts
parentf74bd1942e04a0cedd1e9c8b331141e75add49c0 (diff)
downloadlinux-linaro-stable-554e165cf32610ec9596a183fa1b54a5707fc3cb.tar.gz
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@canonical.com> Cc: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/checkpatch.pl28
1 files changed, 22 insertions, 6 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 06e22caa5692..8199d59d0ad7 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3120,6 +3120,28 @@ 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*)\(/s)
@@ -3291,12 +3313,6 @@ sub process {
WARN("EXPORTED_WORLD_WRITABLE",
"Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
}
-
- # Check for memset with swapped arguments
- if ($line =~ /memset.*\,(\ |)(0x|)0(\ |0|)\);/) {
- 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