linux-kernel - [PATCH 3/10] drivers/acpi: Use kstrdup

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Date:	Fri, 14 May 2010 21:29:03 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 3/10] drivers/acpi: Use kstrdup

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

Use kstrdup when the goal of an allocation is copy a string into the
allocated region.

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

// <smpl>
@@
expression from,to;
expression flag,E1,E2;
statement S;
@@

-  to = kmalloc(strlen(from) + 1,flag);
+  to = kstrdup(from, flag);
   ... when != \(from = E1 \| to = E1 \)
   if (to==NULL || ...) S
   ... when != \(from = E2 \| to = E2 \)
-  strcpy(to, from);
// </smpl>

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

---
 drivers/acpi/scan.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff -u -p a/drivers/acpi/scan.c b/drivers/acpi/scan.c
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1024,13 +1024,12 @@ static void acpi_add_id(struct acpi_devi
 	if (!id)
 		return;
 
-	id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
+	id->id = kstrdup(dev_id, GFP_KERNEL);
 	if (!id->id) {
 		kfree(id);
 		return;
 	}
 
-	strcpy(id->id, dev_id);
 	list_add_tail(&id->list, &device->pnp.ids);
 }
 
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