From: Theodore Ts'o Date: Sat, 26 Mar 2016 20:15:42 +0000 (-0400) Subject: ext4 crypto: use dget_parent() in ext4_d_revalidate() X-Git-Tag: v4.5.2~19 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=022cb9388d1cad67f97d18e4e79047aa402aa6bb;p=thirdparty%2Fkernel%2Fstable.git ext4 crypto: use dget_parent() in ext4_d_revalidate() 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 Signed-off-by: Theodore Ts'o Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c index 38f7562489bbb..ecb54394492ac 100644 --- a/fs/ext4/crypto.c +++ b/fs/ext4/crypto.c @@ -475,13 +475,16 @@ uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size) */ 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 dentry *dentry, unsigned int flags) /* 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