autofs: fix the return value of autofs4_fill_super

While kzallocing sbi/ino fails, it should return -ENOMEM.

And it should return the err value from autofs_prepare_pipe.

Signed-off-by: Rui Xiang <rui.xiang@huawei.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/autofs4/inode.c

@@ -212,10 +212,11 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 	struct autofs_info *ino;
 	int pgrp;
 	bool pgrp_set = false;
+	int ret = -EINVAL;
 
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (!sbi)
-		goto fail_unlock;
+		return -ENOMEM;
 	DPRINTK("starting up, sbi = %p",sbi);
 
 	s->s_fs_info = sbi;
@@ -249,8 +250,10 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 	 * Get the root inode and dentry, but defer checking for errors.
 	 */
 	ino = autofs4_new_ino(sbi);
-	if (!ino)
+	if (!ino) {
+		ret = -ENOMEM;
 		goto fail_free;
+	}
 	root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
 	root = d_make_root(root_inode);
 	if (!root)
@@ -308,7 +311,8 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 		printk("autofs: could not open pipe file descriptor\n");
 		goto fail_dput;
 	}
-	if (autofs_prepare_pipe(pipe) < 0)
+	ret = autofs_prepare_pipe(pipe);
+	if (ret < 0)
 		goto fail_fput;
 	sbi->pipe = pipe;
 	sbi->pipefd = pipefd;
@@ -336,8 +340,7 @@ fail_free:
 	put_pid(sbi->oz_pgrp);
 	kfree(sbi);
 	s->s_fs_info = NULL;
-fail_unlock:
-	return -EINVAL;
+	return ret;
 }
 
 struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)