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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/fs/autofs/dev-ioctl.c
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@@ -1,16 +1,14 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright 2008 Red Hat, Inc. All rights reserved.
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  * Copyright 2008 Ian Kent <raven@themaw.net>
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- *
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- * This file is part of the Linux kernel and is made available under
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- * the terms of the GNU General Public License, version 2, or at your
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- * option, any later version, incorporated herein by reference.
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  */
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 #include <linux/miscdevice.h>
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 #include <linux/compat.h>
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 #include <linux/syscalls.h>
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 #include <linux/magic.h>
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+#include <linux/nospec.h>
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 #include "autofs_i.h"
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14
 
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@@ -23,7 +21,7 @@
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  * another mount. This situation arises when starting automount(8)
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  * or other user space daemon which uses direct mounts or offset
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  * mounts (used for autofs lazy mount/umount of nested mount trees),
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- * which have been left busy at at service shutdown.
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+ * which have been left busy at service shutdown.
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  */
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 typedef int (*ioctl_fn)(struct file *, struct autofs_sb_info *,
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@@ -151,22 +149,6 @@
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 	return err;
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 }
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-/*
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- * Get the autofs super block info struct from the file opened on
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- * the autofs mount point.
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- */
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-static struct autofs_sb_info *autofs_dev_ioctl_sbi(struct file *f)
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-{
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-	struct autofs_sb_info *sbi = NULL;
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-	struct inode *inode;
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-
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-	if (f) {
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-		inode = file_inode(f);
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-		sbi = autofs_sbi(inode->i_sb);
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-	}
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-	return sbi;
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-}
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-
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 /* Return autofs dev ioctl version */
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 static int autofs_dev_ioctl_version(struct file *fp,
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 				    struct autofs_sb_info *sbi,
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@@ -205,7 +187,7 @@
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 	struct path path;
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 	int err;
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189
 
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-	err = kern_path_mountpoint(AT_FDCWD, pathname, &path, 0);
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+	err = kern_path(pathname, LOOKUP_MOUNTPOINT, &path);
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 	if (err)
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 		return err;
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 	err = -ENOENT;
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@@ -366,7 +348,7 @@
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 	pipefd = param->setpipefd.pipefd;
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349
 
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 	mutex_lock(&sbi->wq_mutex);
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-	if (!sbi->catatonic) {
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+	if (!(sbi->flags & AUTOFS_SBI_CATATONIC)) {
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 		mutex_unlock(&sbi->wq_mutex);
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 		return -EBUSY;
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 	} else {
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@@ -393,7 +375,7 @@
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 		swap(sbi->oz_pgrp, new_pid);
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 		sbi->pipefd = pipefd;
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 		sbi->pipe = pipe;
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-		sbi->catatonic = 0;
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+		sbi->flags &= ~AUTOFS_SBI_CATATONIC;
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 	}
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 out:
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 	put_pid(new_pid);
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@@ -515,7 +497,7 @@
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  * located path is the root of a mount we return 1 along with
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  * the super magic of the mount or 0 otherwise.
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  *
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- * In both cases the the device number (as returned by
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+ * In both cases the device number (as returned by
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  * new_encode_dev()) is also returned.
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  */
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 static int autofs_dev_ioctl_ismountpoint(struct file *fp,
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@@ -538,8 +520,8 @@
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520
 
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 	if (!fp || param->ioctlfd == -1) {
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 		if (autofs_type_any(type))
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-			err = kern_path_mountpoint(AT_FDCWD,
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-						   name, &path, LOOKUP_FOLLOW);
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+			err = kern_path(name, LOOKUP_FOLLOW | LOOKUP_MOUNTPOINT,
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+					&path);
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 		else
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 			err = find_autofs_mount(name, &path,
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 						test_by_type, &type);
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@@ -582,7 +564,7 @@
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 static ioctl_fn lookup_dev_ioctl(unsigned int cmd)
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 {
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-	static ioctl_fn _ioctls[] = {
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+	static const ioctl_fn _ioctls[] = {
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 		autofs_dev_ioctl_version,
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 		autofs_dev_ioctl_protover,
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 		autofs_dev_ioctl_protosubver,
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@@ -600,7 +582,10 @@
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 	};
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 	unsigned int idx = cmd_idx(cmd);
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-	return (idx >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[idx];
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+	if (idx >= ARRAY_SIZE(_ioctls))
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+		return NULL;
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+	idx = array_index_nospec(idx, ARRAY_SIZE(_ioctls));
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+	return _ioctls[idx];
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 }
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 /* ioctl dispatcher */
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@@ -658,6 +643,8 @@
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 	if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
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 	    cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD &&
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 	    cmd != AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD) {
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+		struct super_block *sb;
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+
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 		fp = fget(param->ioctlfd);
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 		if (!fp) {
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 			if (cmd == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD)
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@@ -666,12 +653,13 @@
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 			goto out;
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 		}
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-		sbi = autofs_dev_ioctl_sbi(fp);
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-		if (!sbi || sbi->magic != AUTOFS_SBI_MAGIC) {
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+		sb = file_inode(fp)->i_sb;
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+		if (sb->s_type != &autofs_fs_type) {
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 			err = -EINVAL;
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 			fput(fp);
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 			goto out;
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 		}
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+		sbi = autofs_sbi(sb);
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 		/*
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 		 * Admin needs to be able to set the mount catatonic in