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| author | Joe Perches <joe@perches.com> | 2013-11-12 15:10:15 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-13 12:09:25 +0900 |
| commit | 823b794ce176bcf135a062075737be71a78629dd (patch) | |
| tree | 27ee885ad9d07e3421f04e846a3507b74ffe1fa7 /scripts | |
| parent | 2b7ab45395dc4d91ef30985f76d90a8f28f58c27 (diff) | |
| download | lwn-823b794ce176bcf135a062075737be71a78629dd.tar.gz lwn-823b794ce176bcf135a062075737be71a78629dd.zip | |
checkpatch: add check for sscanf without return use
Naked use sscanf can be troublesome because the pointed to variables may
not have been set.
Add a warning when the sscanf return value is not used.
For now, do not add __must_check to the sscanf prototype because that will
cause a couple of hundred new warnings when compiling a kernel.
Signed-off-by: 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-x | scripts/checkpatch.pl | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 1eb5d2fa8d20..61090e0ff613 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -4019,6 +4019,23 @@ sub process { } } +# check for naked sscanf + if ($^V && $^V ge 5.10.0 && + defined $stat && + $stat =~ /\bsscanf\b/ && + ($stat !~ /$Ident\s*=\s*sscanf\s*$balanced_parens/ && + $stat !~ /\bsscanf\s*$balanced_parens\s*(?:$Compare)/ && + $stat !~ /(?:$Compare)\s*\bsscanf\s*$balanced_parens/)) { + my $lc = $stat =~ tr@\n@@; + $lc = $lc + $linenr; + my $stat_real = raw_line($linenr, 0); + for (my $count = $linenr + 1; $count <= $lc; $count++) { + $stat_real = $stat_real . "\n" . raw_line($count, 0); + } + WARN("NAKED_SSCANF", + "unchecked sscanf return value\n" . "$here\n$stat_real\n"); + } + # check for new externs in .h files. if ($realfile =~ /\.h$/ && $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) { |