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

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Message-Id: <1287341311-11161-4-git-send-email-julia@diku.dk>
Date:	Sun, 17 Oct 2010 20:48:31 +0200
From:	Julia Lawall <julia@...u.dk>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	kernel-janitors@...r.kernel.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] fs/jffs2/dir.c: Use kasprintf

Convert a sequence of kmalloc and memcpy to use kasprintf.  The argument is
checked for being a string by the presence of a previous call to strlen.

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

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

  len = strlen(arg)
  ... when != len = e1
      when != arg = e2
  a =
-  \(kmalloc\|kzalloc\)(len+1,flag)
+  kasprintf(flag,"%s",arg)
  <... 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 --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index ed78a3c..8ee5675 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -367,7 +367,7 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
 	}
 
 	/* We use f->target field to store the target path. */
-	f->target = kmalloc(targetlen + 1, GFP_KERNEL);
+	f->target = kasprintf(GFP_KERNEL, "%s", target);
 	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 *dir_i, struct dentry *dentry, const char
 		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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