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checkpatch: check for common memset parameter issues against statments

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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>
This commit is contained in:
Andy Whitcroft 2012-01-10 15:09:57 -08:00 committed by Linus Torvalds
parent f74bd1942e
commit 554e165cf3
1 changed files with 22 additions and 6 deletions
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28
scripts/checkpatch.pl
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@ -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