This is a note to let you know that I've just added the patch titled ext4 crypto: use dget_parent() in ext4_d_revalidate() to the 4.5-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ext4-crypto-use-dget_parent-in-ext4_d_revalidate.patch and it can be found in the queue-4.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 3d43bcfef5f0548845a425365011c499875491b0 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o <tytso@xxxxxxx> Date: Sat, 26 Mar 2016 16:15:42 -0400 Subject: ext4 crypto: use dget_parent() in ext4_d_revalidate() From: Theodore Ts'o <tytso@xxxxxxx> commit 3d43bcfef5f0548845a425365011c499875491b0 upstream. This avoids potential problems caused by a race where the inode gets renamed out from its parent directory and the parent directory is deleted while ext4_d_revalidate() is running. Fixes: 28b4c263961c Reported-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/ext4/crypto.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/fs/ext4/crypto.c +++ b/fs/ext4/crypto.c @@ -475,13 +475,16 @@ uint32_t ext4_validate_encryption_key_si */ static int ext4_d_revalidate(struct dentry *dentry, unsigned int flags) { - struct inode *dir = d_inode(dentry->d_parent); - struct ext4_crypt_info *ci = EXT4_I(dir)->i_crypt_info; + struct dentry *dir; + struct ext4_crypt_info *ci; int dir_has_key, cached_with_key; - if (!ext4_encrypted_inode(dir)) + dir = dget_parent(dentry); + if (!ext4_encrypted_inode(d_inode(dir))) { + dput(dir); return 0; - + } + ci = EXT4_I(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) | @@ -491,6 +494,7 @@ static int ext4_d_revalidate(struct dent /* this should eventually be an flag in d_flags */ cached_with_key = dentry->d_fsdata != NULL; dir_has_key = (ci != NULL); + dput(dir); /* * If the dentry was cached without the key, and it is a Patches currently in stable-queue which might be from tytso@xxxxxxx are queue-4.5/ext4-use-dget_parent-in-ext4_file_open.patch queue-4.5/ext4-add-lockdep-annotations-for-i_data_sem.patch queue-4.5/ext4-use-file_dentry.patch queue-4.5/ext4-ignore-quota-mount-options-if-the-quota-feature-is-enabled.patch queue-4.5/nfs-use-file_dentry.patch queue-4.5/ext4-crypto-use-dget_parent-in-ext4_d_revalidate.patch queue-4.5/fs-add-file_dentry.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html