linux-kernel - [PATCH 1/3] fscrypto: use dget_parent() in fscrypt_d

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Date:	Tue, 12 Apr 2016 10:27:20 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>, Theodore Ts'o <tytso@....edu>
Subject: [PATCH 1/3] 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@....edu>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/crypto/crypto.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index 7f58045..58ae0ba 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
-- 
2.6.3