diff options
| -rw-r--r-- | fs/overlayfs/namei.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index bf722daf19a9..f75c49ceb460 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -1371,7 +1371,7 @@ out: bool ovl_lower_positive(struct dentry *dentry) { struct ovl_entry *poe = OVL_E(dentry->d_parent); - struct qstr *name = &dentry->d_name; + const struct qstr *name = &dentry->d_name; const struct cred *old_cred; unsigned int i; bool positive = false; @@ -1394,9 +1394,15 @@ bool ovl_lower_positive(struct dentry *dentry) struct dentry *this; struct ovl_path *parentpath = &ovl_lowerstack(poe)[i]; + /* + * We need to make a non-const copy of dentry->d_name, + * because lookup_one_positive_unlocked() will hash name + * with parentpath base, which is on another (lower fs). + */ this = lookup_one_positive_unlocked( mnt_idmap(parentpath->layer->mnt), - name, parentpath->dentry); + &QSTR_LEN(name->name, name->len), + parentpath->dentry); if (IS_ERR(this)) { switch (PTR_ERR(this)) { case -ENOENT: |