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authorJaegeuk Kim <jaegeuk@kernel.org>2016-04-13 02:05:36 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2016-04-13 06:01:35 +0300
commit03a8bb0e53d9562276045bdfcf2b5de2e4cff5a1 (patch)
tree558c4c5fe4471d2570a23bb16dbe85c8ee0999ed
parentb32e4482aadfd1322357f46d4ed8a990603664d9 (diff)
downloadlinux-03a8bb0e53d9562276045bdfcf2b5de2e4cff5a1.tar.xz
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>
-rw-r--r--fs/crypto/crypto.c4
-rw-r--r--fs/ext4/crypto.c4
2 files changed, 8 insertions, 0 deletions
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index da70520f3ab4..2fc8c43ce531 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -26,6 +26,7 @@
#include <linux/ratelimit.h>
#include <linux/bio.h>
#include <linux/dcache.h>
+#include <linux/namei.h>
#include <linux/fscrypto.h>
#include <linux/ecryptfs.h>
@@ -353,6 +354,9 @@ static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags)
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);
diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
index db9ae6e18154..6a6c27373b54 100644
--- a/fs/ext4/crypto.c
+++ b/fs/ext4/crypto.c
@@ -32,6 +32,7 @@
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <linux/spinlock_types.h>
+#include <linux/namei.h>
#include "ext4_extents.h"
#include "xattr.h"
@@ -482,6 +483,9 @@ 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);