fs/cifs: Fix resource leak

The -EIO error return path is leaking memory allocated
to page. Fix this by moving the allocation block after
the check of cifs_forced_shutdown.

Addresses-Coverity: ("Resource leak")
Fixes: 087f757 ("cifs: add shutdown support")
Signed-off-by: Khaled ROMDHANI <khaledromdhani216@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: khaled-R216

fs/cifs/link.c

@@ -683,12 +683,16 @@ cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
 	struct tcon_link *tlink;
 	struct cifs_tcon *pTcon;
 	const char *full_path;
-	void *page = alloc_dentry_path();
+	void *page;
 	struct inode *newinode = NULL;
 
 	if (unlikely(cifs_forced_shutdown(cifs_sb)))
 		return -EIO;
 
+	page = alloc_dentry_path();
+	if (!page)
+		return -ENOMEM;
+
 	xid = get_xid();
 
 	tlink = cifs_sb_tlink(cifs_sb);