ubifs: remove redundant checks for encryption key

In several places, ubifs checked for an encryption key before creating a
file in an encrypted directory.  This was redundant with
fscrypt_setup_filename() or ubifs_new_inode(), and in the case of
ubifs_link() it broke linking to special files.  So remove the extra
checks.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 3 insertions, 55 deletions

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 1c5331ac9614..528369f3e472 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -390,16 +390,6 @@ static int do_tmpfile(struct inode *dir, struct dentry *dentry,
         dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
                 dentry, mode, dir->i_ino);
 
-        if (ubifs_crypt_is_encrypted(dir)) {
-                err = fscrypt_get_encryption_info(dir);
-                if (err)
-                        return err;
-
-                if (!fscrypt_has_encryption_key(dir)) {
-                        return -EPERM;
-                }
-        }
-
         err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
         if (err)
                 return err;
@@ -741,17 +731,9 @@ static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
         ubifs_assert(inode_is_locked(dir));
         ubifs_assert(inode_is_locked(inode));
 
-        if (ubifs_crypt_is_encrypted(dir)) {
-                if (!fscrypt_has_permitted_context(dir, inode))
-                        return -EPERM;
-
-                err = fscrypt_get_encryption_info(inode);
-                if (err)
-                        return err;
-
-                if (!fscrypt_has_encryption_key(inode))
-                        return -EPERM;
-        }
+        if (ubifs_crypt_is_encrypted(dir) &&
+            !fscrypt_has_permitted_context(dir, inode))
+                return -EPERM;
 
         err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
         if (err)
@@ -1000,17 +982,6 @@ static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
         if (err)
                 return err;
 
-        if (ubifs_crypt_is_encrypted(dir)) {
-                err = fscrypt_get_encryption_info(dir);
-                if (err)
-                        goto out_budg;
-
-                if (!fscrypt_has_encryption_key(dir)) {
-                        err = -EPERM;
-                        goto out_budg;
-                }
-        }
-
         err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
         if (err)
                 goto out_budg;
@@ -1096,17 +1067,6 @@ static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
                 return err;
         }
 
-        if (ubifs_crypt_is_encrypted(dir)) {
-                err = fscrypt_get_encryption_info(dir);
-                if (err)
-                        goto out_budg;
-
-                if (!fscrypt_has_encryption_key(dir)) {
-                        err = -EPERM;
-                        goto out_budg;
-                }
-        }
-
         err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
         if (err)
                 goto out_budg;
@@ -1231,18 +1191,6 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
                         goto out_inode;
                 }
 
-                err = fscrypt_get_encryption_info(inode);
-                if (err) {
-                        kfree(sd);
-                        goto out_inode;
-                }
-
-                if (!fscrypt_has_encryption_key(inode)) {
-                        kfree(sd);
-                        err = -EPERM;
-                        goto out_inode;
-                }
-
                 ostr.name = sd->encrypted_path;
                 ostr.len = disk_link.len;