fscrypto: use dget_parent() in fscrypt_d_revalidate()

This patch updates fscrypto along with the below ext4 crypto change.

Fixes: 3d43bcfef5f0 ("ext4 crypto: use dget_parent() in ext4_d_revalidate()")
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index 7f5804537d30..58ae0ba91ca2 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -345,13 +345,17 @@ EXPORT_SYMBOL(fscrypt_zeroout_range);
  */
 static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags)
 {
-        struct inode *dir = d_inode(dentry->d_parent);
-        struct fscrypt_info *ci = dir->i_crypt_info;
+        struct dentry *dir;
+        struct fscrypt_info *ci;
         int dir_has_key, cached_with_key;
 
-        if (!dir->i_sb->s_cop->is_encrypted(dir))
+        dir = dget_parent(dentry);
+        if (!d_inode(dir)->i_sb->s_cop->is_encrypted(d_inode(dir))) {
+                dput(dir);
                 return 0;
+        }
 
+        ci = d_inode(dir)->i_crypt_info;
         if (ci && ci->ci_keyring_key &&
             (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
                                           (1 << KEY_FLAG_REVOKED) |
@@ -363,6 +367,7 @@ static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags)
         cached_with_key = dentry->d_flags & DCACHE_ENCRYPTED_WITH_KEY;
         spin_unlock(&dentry->d_lock);
         dir_has_key = (ci != NULL);
+        dput(dir);
 
         /*
          * If the dentry was cached without the key, and it is a