linux-kernel - [PATCH] Prevent use of unitialized variable

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Date:	Fri, 11 Jan 2013 09:55:20 +0100
From:	Fredrik Gustafsson <iveqy@...qy.com>
To:	apw@...onical.com
Cc:	linux-kernel@...r.kernel.org, iveqy@...qy.com
Subject: [PATCH] Prevent use of unitialized variable

Run checkpatch.pl -f kernel/fork.c in commit
ecf02a607bd801e742d7bb35c6e40f7ca15edf03
and checkpatch.pl will try to use an uninitialized variable.
This patch fixes that.

Signed-off-by: Fredrik Gustafsson <iveqy@...qy.com>
---
 scripts/checkpatch.pl |   19 +++++++++++--------
 1 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 4d2c7df..4e34368 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3363,14 +3363,17 @@ sub process {
 
 			my $ms_addr = $2;
 			my $ms_val = $7;
-			my $ms_size = $12;
-
-			if ($ms_size =~ /^(0x|)0$/i) {
-				ERROR("MEMSET",
-				      "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
-			} elsif ($ms_size =~ /^(0x|)1$/i) {
-				WARN("MEMSET",
-				     "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
+
+			if (defined $12) {
+				my $ms_size = $12;
+
+				if ($ms_size =~ /^(0x|)0$/i) {
+					ERROR("MEMSET",
+						  "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
+				} elsif ($ms_size =~ /^(0x|)1$/i) {
+					WARN("MEMSET",
+						 "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
+				}
 			}
 		}
 
-- 
1.7.2.5

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