UBIFS: Use kmemdup rather than duplicating its implementation

The semantic patch that makes this change is available
in scripts/coccinelle/api/memdup.cocci.
Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

fs/ubifs/lpt.c

@@ -1986,12 +1986,11 @@ int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum,
 
 				if (path[h].in_tree)
 					continue;
-				nnode = kmalloc(sz, GFP_NOFS);
+				nnode = kmemdup(&path[h].nnode, sz, GFP_NOFS);
 				if (!nnode) {
 					err = -ENOMEM;
 					goto out;
 				}
-				memcpy(nnode, &path[h].nnode, sz);
 				parent = nnode->parent;
 				parent->nbranch[nnode->iip].nnode = nnode;
 				path[h].ptr.nnode = nnode;
@@ -2004,12 +2003,11 @@ int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum,
 				const size_t sz = sizeof(struct ubifs_pnode);
 				struct ubifs_nnode *parent;
 
-				pnode = kmalloc(sz, GFP_NOFS);
+				pnode = kmemdup(&path[h].pnode, sz, GFP_NOFS);
 				if (!pnode) {
 					err = -ENOMEM;
 					goto out;
 				}
-				memcpy(pnode, &path[h].pnode, sz);
 				parent = pnode->parent;
 				parent->nbranch[pnode->iip].pnode = pnode;
 				path[h].ptr.pnode = pnode;

fs/ubifs/tnc.c

@@ -344,12 +344,11 @@ static int lnc_add(struct ubifs_info *c, struct ubifs_zbranch *zbr,
 		return err;
 	}
 
-	lnc_node = kmalloc(zbr->len, GFP_NOFS);
+	lnc_node = kmemdup(node, zbr->len, GFP_NOFS);
 	if (!lnc_node)
 		/* We don't have to have the cache, so no error */
 		return 0;
 
-	memcpy(lnc_node, node, zbr->len);
 	zbr->leaf = lnc_node;
 	return 0;
 }

fs/ubifs/xattr.c

@@ -138,12 +138,11 @@ static int create_xattr(struct ubifs_info *c, struct inode *host,
 	ui = ubifs_inode(inode);
 	ui->xattr = 1;
 	ui->flags |= UBIFS_XATTR_FL;
-	ui->data = kmalloc(size, GFP_NOFS);
+	ui->data = kmemdup(value, size, GFP_NOFS);
 	if (!ui->data) {
 		err = -ENOMEM;
 		goto out_free;
 	}
-	memcpy(ui->data, value, size);
 	inode->i_size = ui->ui_size = size;
 	ui->data_len = size;
 
@@ -204,12 +203,11 @@ static int change_xattr(struct ubifs_info *c, struct inode *host,
 		return err;
 
 	kfree(ui->data);
-	ui->data = kmalloc(size, GFP_NOFS);
+	ui->data = kmemdup(value, size, GFP_NOFS);
 	if (!ui->data) {
 		err = -ENOMEM;
 		goto out_free;
 	}
-	memcpy(ui->data, value, size);
 	inode->i_size = ui->ui_size = size;
 	ui->data_len = size;