From: André Goddard Rosa <andre.goddard@gmail.com>
Date: Tue, 15 Dec 2009 02:00:56 +0000 (-0800)
Subject: vsprintf: pre-calculate final string length for later use
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=6c356634111c5a7a48264d7c9ec28559e4be11a2;p=deliverable%2Flinux.git

vsprintf: pre-calculate final string length for later use

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index e5ab51fc2d9e..99747a58ec72 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1496,13 +1496,14 @@ 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)";
-			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;
 		}