linux-kernel - [PATCH v2 2/7] vsprintf: pre-calculate final string length

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Message-ID: <b8bf37780911020926n35e36536w2de68ba80c87e669@mail.gmail.com>
Date:	Mon, 2 Nov 2009 15:26:18 -0200
From:	André Goddard Rosa <andre.goddard@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>, laijs@...fujitsu.com,
	mingo@...e.hu, davem@...emloft.net, akpm@...ux-foundation.org,
	harvey.harrison@...il.com,
	linux list <linux-kernel@...r.kernel.org>
Cc:	me <andre.goddard@...il.com>
Subject: [PATCH v2 2/7] vsprintf: pre-calculate final string length

>From ad7ae7336da94fd87f8a2ef48ded02849d8f2e90 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Goddard=20Rosa?= <andre.goddard@...il.com>
Date: Sun, 1 Nov 2009 12:21:50 -0200
Subject: [PATCH v2 2/7] vsprintf: pre-calculate final string length
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: André Goddard Rosa <andre.goddard@...il.com>
---
 lib/vsprintf.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 002f462..403e835 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1445,13 +1445,15 @@ do {									\
 		case FORMAT_TYPE_STR: {
 			const char *save_str = va_arg(args, char *);
 			size_t len;
+
 			if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
 					|| (unsigned long)save_str < PAGE_SIZE)
 				save_str = null_str;
-			len = strlen(save_str);
-			if (str + len + 1 < end)
-				memcpy(str, save_str, len + 1);
-			str += len + 1;
+			len = strlen(save_str) + 1;
+			if (str + len < end)
+				memcpy(str, save_str, len);
+			str += len;
+
 			break;
 		}

-- 
1.6.5.2.140.g5f809
--
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