From: Joe Perches <joe@perches.com>
Date: Tue, 5 Nov 2013 05:56:58 +0000 (+1100)
Subject: checkpatch: add check for sscanf without return use
X-Git-Tag: next-20131105~2^2~100
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=986e9823356d4fd13ca517a5017901190104cc4a;p=karo-tx-linux.git

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>
---

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 6e0f1ec0d6f2..35327d0d5bc9 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4014,6 +4014,23 @@ 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*(?:==|\!=)/ &&
+		     $stat !~ /(?:==|\!=)\s*\bsscanf\s*$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) {