linux-kernel - [PATCH 6/6] drivers/char/ppdev.c: Use kasprintf

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Date:	Wed, 10 Mar 2010 22:17:28 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 6/6] drivers/char/ppdev.c: Use kasprintf

From: Julia Lawall <julia@...u.dk>

kasprintf combines kmalloc and sprintf, and takes care of the size
calculation itself.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression a,flag;
expression list args;
statement S;
@@

  a =
-  \(kmalloc\|kzalloc\)(...,flag)
+  kasprintf(flag,args)
  <... when != a
  if (a == NULL || ...) S
  ...>
- sprintf(a,args);
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/char/ppdev.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff -u -p a/drivers/char/ppdev.c b/drivers/char/ppdev.c
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -286,12 +286,10 @@ static int register_device (int minor, s
 	char *name;
 	int fl;
 
-	name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL);
+	name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
 	if (name == NULL)
 		return -ENOMEM;
 
-	sprintf (name, CHRDEV "%x", minor);
-
 	port = parport_find_number (minor);
 	if (!port) {
 		printk (KERN_WARNING "%s: no associated port!\n", name);
--
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