[PATCH] ubifs: reject unsupported ioctl flags explicitly

[Hou Tao <houtao1@xxxxxxxxxx>]

Reject unsupported ioctl flags explicitly, so the following command
on a regular ubifs file will fail:
	chattr +d ubifs_file

And xfstests generic/424 will pass.

Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx>
---
 fs/ubifs/ioctl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c
index 0164bcc827f8..daf9f93e15de 100644
--- a/fs/ubifs/ioctl.c
+++ b/fs/ubifs/ioctl.c
@@ -28,6 +28,11 @@
 #include <linux/mount.h>
 #include "ubifs.h"
 
+/* Need to be kept consistent with checked flags in ioctl2ubifs() */
+#define UBIFS_SUPPORTED_IOCTL_FLAGS \
+	(FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \
+	 FS_IMMUTABLE_FL | FS_DIRSYNC_FL)
+
 /**
  * ubifs_set_inode_flags - set VFS inode flags.
  * @inode: VFS inode to set flags for
@@ -169,6 +174,9 @@ long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		if (get_user(flags, (int __user *) arg))
 			return -EFAULT;
 
+		if (flags & ~UBIFS_SUPPORTED_IOCTL_FLAGS)
+			return -EOPNOTSUPP;
+
 		if (!S_ISDIR(inode->i_mode))
 			flags &= ~FS_DIRSYNC_FL;
 
-- 
2.16.2.dirty


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