ext4/fscrypto: avoid RCU lookup in d_revalidate
As Al pointed, d_revalidate should return RCU lookup before using d_inode.
This was originally introduced by:
commit 34286d666230 ("fs: rcu-walk aware d_revalidate method").
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: stable <stable@vger.kernel.org>
Conflicts:
fs/ext4/crypto.c
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index 1447ea0..a340a6f 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -28,6 +28,7 @@
#include <linux/ratelimit.h>
#include <linux/bio.h>
#include <linux/dcache.h>
+#include <linux/namei.h>
#include <linux/fscrypto.h>
static unsigned int num_prealloc_crypto_pages = 32;
@@ -352,6 +353,9 @@
struct fscrypt_info *ci;
int dir_has_key, cached_with_key;
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
dir = dget_parent(dentry);
if (!d_inode(dir)->i_sb->s_cop->is_encrypted(d_inode(dir))) {
dput(dir);
