commit 798434bda36e357af9ccaf68a7ba1129658c8332
author Al Viro <viro@zeniv.linux.org.uk> Thu Mar 24 20:38:43 2016 -0400
committer Al Viro <viro@zeniv.linux.org.uk> Sun Mar 27 23:49:22 2016 -0400
tree 2dd563e07a00767f65a83201771293508bedd238
parent 322ea0bbf3003df17b6253f76e572c37d79a6810

__d_alloc(): treat NULL name as QSTR("/", 1)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index 32ceae3..3cb98df 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1558,7 +1558,11 @@
 	 * be overwriting an internal NUL character
 	 */
 	dentry->d_iname[DNAME_INLINE_LEN-1] = 0;
-	if (name->len > DNAME_INLINE_LEN-1) {
+	if (unlikely(!name)) {
+		static const struct qstr anon = QSTR_INIT("/", 1);
+		name = &anon;
+		dname = dentry->d_iname;
+	} else if (name->len > DNAME_INLINE_LEN-1) {
 		size_t size = offsetof(struct external_name, name[1]);
 		struct external_name *p = kmalloc(size + name->len,
 						  GFP_KERNEL_ACCOUNT);
@@ -1812,9 +1816,7 @@
 	struct dentry *res = NULL;
 
 	if (root_inode) {
-		static const struct qstr name = QSTR_INIT("/", 1);
-
-		res = __d_alloc(root_inode->i_sb, &name);
+		res = __d_alloc(root_inode->i_sb, NULL);
 		if (res)
 			d_instantiate(res, root_inode);
 		else
@@ -1855,7 +1857,6 @@
 
 static struct dentry *__d_obtain_alias(struct inode *inode, int disconnected)
 {
-	static const struct qstr anonstring = QSTR_INIT("/", 1);
 	struct dentry *tmp;
 	struct dentry *res;
 	unsigned add_flags;
@@ -1869,7 +1870,7 @@
 	if (res)
 		goto out_iput;
 
-	tmp = __d_alloc(inode->i_sb, &anonstring);
+	tmp = __d_alloc(inode->i_sb, NULL);
 	if (!tmp) {
 		res = ERR_PTR(-ENOMEM);
 		goto out_iput;