linux-kernel - [PATCH 2/3] fs/ceph/xattr.c: Use kasprintf

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Date:	Sun, 17 Oct 2010 20:48:30 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Sage Weil <sage@...dream.net>
Cc:	kernel-janitors@...r.kernel.org, ceph-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] fs/ceph/xattr.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/ceph/xattr.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 70e9199..b8dd1f0 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -716,10 +716,9 @@ int ceph_setxattr(struct dentry *dentry, const char *name,
 
 	/* preallocate memory for xattr name, value, index node */
 	err = -ENOMEM;
-	newname = kmalloc(name_len + 1, GFP_NOFS);
+	newname = kasprintf(GFP_NOFS, "%s", name);
 	if (!newname)
 		goto out;
-	memcpy(newname, name, name_len + 1);
 
 	if (val_len) {
 		newval = kmalloc(val_len + 1, GFP_NOFS);

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