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ext4/fscrypto: avoid RCU lookup in d_revalidate

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As Al pointed, d_revalidate should return RCU lookup before using d_inode.
This was originally introduced by:
commit 34286d6662 ("fs: rcu-walk aware d_revalidate method").

Change-Id: I81999f7b4651d7dd64695c94d15561dfdcec851b
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>
Git-commit: 03a8bb0e53d9562276045bdfcf2b5de2e4cff5a1
Git-repo: git://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git
[andreym@codeaurora.org: resolve merge conflicts,
 fs/crypto/crypto.c does not exist in current branch,
 had to omit it]
Signed-off-by: Andrey Markovytch <andreym@codeaurora.org>
This commit is contained in:
Jaegeuk Kim 2017-01-26 11:50:00 +02:00 • committed by Gerrit - the friendly Code Review server
parent 958e36a73f
commit bfae7d5cd2
1 changed files with 4 additions and 0 deletions
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4
fs/ext4/crypto.c
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@ -34,6 +34,7 @@
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <linux/spinlock_types.h>
#include <linux/namei.h>
#include "ext4_extents.h"
#include "xattr.h"
@ -487,6 +488,9 @@ static int ext4_d_revalidate(struct dentry *dentry, unsigned int flags)
struct ext4_crypt_info *ci;
int dir_has_key, cached_with_key;
if (flags & LOOKUP_RCU)
return -ECHILD;
dir = dget_parent(dentry);
if (!ext4_encrypted_inode(d_inode(dir))) {
dput(dir);