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authorEric Biggers <ebiggers@google.com>2017-02-01 21:07:11 -0500
committerTheodore Ts'o <tytso@mit.edu>2017-02-01 21:07:11 -0500
commitdd01b690f8f4b1e414f89e5a9a5326bf720d6652 (patch)
tree9a6e1087c7d858d0a747956bfca32292413a11fd /fs/ext4/namei.c
parentdbfcef6b0f4012c57bc0b6e0e660d5ed12a5eaed (diff)
downloadlinux-stericsson-dd01b690f8f4b1e414f89e5a9a5326bf720d6652.tar.gz
ext4: fix use-after-iput when fscrypt contexts are inconsistent
In the case where the child's encryption context was inconsistent with its parent directory, we were using inode->i_sb and inode->i_ino after the inode had already been iput(). Fix this by doing the iput() in the correct places. Note: only ext4 had this bug, not f2fs and ubifs. Fixes: d9cdc9033181 ("ext4 crypto: enforce context consistency") Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index bb880c326191..931da9d5d915 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1618,13 +1618,15 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
!fscrypt_has_permitted_context(dir, inode)) {
int nokey = ext4_encrypted_inode(inode) &&
!fscrypt_has_encryption_key(inode);
- iput(inode);
- if (nokey)
+ if (nokey) {
+ iput(inode);
return ERR_PTR(-ENOKEY);
+ }
ext4_warning(inode->i_sb,
"Inconsistent encryption contexts: %lu/%lu",
(unsigned long) dir->i_ino,
(unsigned long) inode->i_ino);
+ iput(inode);
return ERR_PTR(-EPERM);
}
}