From: Eric Biggers <ebiggers@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
fs/ext4/namei.c | 6 ++++--
1 file 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);
}
}
--
2.11.0.483.g087da7b7c-goog
