linux-kernel - [patch] kgdb: strlen() doesn't count the terminator

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Message-ID: <20101209112821.GU10623@bicker>
Date:	Thu, 9 Dec 2010 14:28:21 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	Paul Mundt <lethal@...ux-sh.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
	Tilman Sauerbeck <tilman@...e-monkey.de>,
	kernel-janitors@...r.kernel.org
Subject: [patch] kgdb: strlen() doesn't count the terminator

This is an off by one because strlen() doesn't count the null
terminator.  We strcpy() these strings into an array of size
MAX_CONFIG_LEN.

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
index 59c118c..27dc463 100644
--- a/drivers/misc/kgdbts.c
+++ b/drivers/misc/kgdbts.c
@@ -988,7 +988,7 @@ static void kgdbts_run_tests(void)
 
 static int kgdbts_option_setup(char *opt)
 {
-	if (strlen(opt) > MAX_CONFIG_LEN) {
+	if (strlen(opt) >= MAX_CONFIG_LEN) {
 		printk(KERN_ERR "kgdbts: config string too long\n");
 		return -ENOSPC;
 	}
diff --git a/drivers/serial/kgdboc.c b/drivers/serial/kgdboc.c
index 3374618..ec1748b 100644
--- a/drivers/serial/kgdboc.c
+++ b/drivers/serial/kgdboc.c
@@ -130,7 +130,7 @@ static void kgdboc_unregister_kbd(void)
 
 static int kgdboc_option_setup(char *opt)
 {
-	if (strlen(opt) > MAX_CONFIG_LEN) {
+	if (strlen(opt) >= MAX_CONFIG_LEN) {
 		printk(KERN_ERR "kgdboc: config string too long\n");
 		return -ENOSPC;
 	}
--
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