...otherwise an user can enable encryption for certain files even
when the filesystem is unable to support it.
Such a case would be a filesystem created by mkfs.ext4's default
settings, 1KiB block size. Ext4 supports encyption only when block size
is equal to PAGE_SIZE.
But this constraint is only checked when the encryption feature flag
is set.

Signed-off-by: Richard Weinberger <rich...@nod.at>
---
 fs/ext4/ioctl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 1bb7df5..9e9a73e 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -772,6 +772,9 @@ resizefs_out:
 #ifdef CONFIG_EXT4_FS_ENCRYPTION
                struct fscrypt_policy policy;
 
+               if (!ext4_has_feature_encrypt(sb))
+                       return -EOPNOTSUPP;
+
                if (copy_from_user(&policy,
                                   (struct fscrypt_policy __user *)arg,
                                   sizeof(policy)))
-- 
2.7.3

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