linux-kernel - [PATCHv3] Documentation: laptops: freefall.c: simplify to avoid null-termination problems

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Date:	Mon, 28 Jul 2014 13:13:51 +0200
From:	Pavel Machek <pavel@....cz>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Pali Rohár <pali.rohar@...il.com>,
	Stefan Weil <sw@...lnetz.de>, Jiri Kosina <jkosina@...e.cz>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	trivial@...nel.org
Subject: [PATCHv3] Documentation: laptops: freefall.c: simplify to avoid
 null-termination problems


Copying to local variable is actually not neccessary, if all we need
to do is snprintf(). This also removes problem where devname could be
missing zero termination.

Reported-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Signed-off-by: Pavel Machek <pavel@....cz>

diff --git a/Documentation/laptops/freefall.c b/Documentation/laptops/freefall.c
index aab2ff0..5e44b20 100644
--- a/Documentation/laptops/freefall.c
+++ b/Documentation/laptops/freefall.c
@@ -29,15 +29,12 @@ static const char app_name[] = "FREE FALL";
 
 static int set_unload_heads_path(char *device)
 {
-	char devname[64];
-
 	if (strlen(device) <= 5 || strncmp(device, "/dev/", 5) != 0)
 		return -EINVAL;
-	strncpy(devname, device + 5, sizeof(devname) - 1);
 	strncpy(device_path, device, sizeof(device_path) - 1);
 
 	snprintf(unload_heads_path, sizeof(unload_heads_path) - 1,
-				"/sys/block/%s/device/unload_heads", devname);
+				"/sys/block/%s/device/unload_heads", device+5);
 	return 0;
 }
 



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