linux-kernel - [PATCH 11/12] dma-debug: Cleanup for copy-loop in filter

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Date:	Wed, 7 Apr 2010 14:46:48 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...hat.com>
CC:	x86@...nel.org, iommu@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Dan Carpenter <error27@...il.com>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 11/12] dma-debug: Cleanup for copy-loop in filter_write()

From: Dan Carpenter <error27@...il.com>

Earlier in this function we set the last byte of "buf" to NULL so we
always hit the break statement and "i" is never equal to NAME_MAX_LEN.
This patch doesn't change how the driver works but it silences a Smatch
warning and it makes it clearer that we don't write past the end of the
array.

Signed-off-by: Dan Carpenter <error27@...il.com>
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 lib/dma-debug.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index ba8b670..01e6427 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -570,7 +570,7 @@ static ssize_t filter_write(struct file *file, const char __user *userbuf,
 	 * Now parse out the first token and use it as the name for the
 	 * driver to filter for.
 	 */
-	for (i = 0; i < NAME_MAX_LEN; ++i) {
+	for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
 		current_driver_name[i] = buf[i];
 		if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
 			break;
-- 
1.7.0.4


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