linux-kernel - [PATCH 3/3] fs/jffs2/dir.c: Use kmemdup

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Date:	Sun, 17 Oct 2010 21:56:15 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Joe Perches <joe@...ches.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] fs/jffs2/dir.c: Use kmemdup

Convert a sequence of kmalloc and memcpy to use kmemdup.

The semantic patch that performs this transformation is:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression a,flag,len;
expression arg,e1,e2;
statement S;
@@

  a =
-  \(kmalloc\|kzalloc\)(len,flag)
+  kmemdup(arg,len,flag)
  <... when != a
  if (a == NULL || ...) S
  ...>
- memcpy(a,arg,len+1);
// </smpl>

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

---
 fs/jffs2/dir.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff -u -p a/fs/jffs2/dir.c b/fs/jffs2/dir.c
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -367,7 +367,7 @@ static int jffs2_symlink (struct inode *
 	}
 
 	/* We use f->target field to store the target path. */
-	f->target = kmalloc(targetlen + 1, GFP_KERNEL);
+	f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
 	if (!f->target) {
 		printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 		mutex_unlock(&f->sem);
@@ -376,7 +376,6 @@ static int jffs2_symlink (struct inode *
 		goto fail;
 	}
 
-	memcpy(f->target, target, targetlen + 1);
 	D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 
 	/* No data here. Only a metadata node, which will be
--
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