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-rw-r--r--security/keys/keyring.c27
1 files changed, 15 insertions, 12 deletions
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 8c05ebd7203d..d80311e571c3 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -1063,12 +1063,6 @@ int __key_link_begin(struct key *keyring,
if (index_key->type == &key_type_keyring)
down_write(&keyring_serialise_link_sem);
- /* check that we aren't going to overrun the user's quota */
- ret = key_payload_reserve(keyring,
- keyring->datalen + KEYQUOTA_LINK_BYTES);
- if (ret < 0)
- goto error_sem;
-
/* Create an edit script that will insert/replace the key in the
* keyring tree.
*/
@@ -1078,17 +1072,25 @@ int __key_link_begin(struct key *keyring,
NULL);
if (IS_ERR(edit)) {
ret = PTR_ERR(edit);
- goto error_quota;
+ goto error_sem;
+ }
+
+ /* If we're not replacing a link in-place then we're going to need some
+ * extra quota.
+ */
+ if (!edit->dead_leaf) {
+ ret = key_payload_reserve(keyring,
+ keyring->datalen + KEYQUOTA_LINK_BYTES);
+ if (ret < 0)
+ goto error_cancel;
}
*_edit = edit;
kleave(" = 0");
return 0;
-error_quota:
- /* undo the quota changes */
- key_payload_reserve(keyring,
- keyring->datalen - KEYQUOTA_LINK_BYTES);
+error_cancel:
+ assoc_array_cancel_edit(edit);
error_sem:
if (index_key->type == &key_type_keyring)
up_write(&keyring_serialise_link_sem);
@@ -1146,7 +1148,7 @@ void __key_link_end(struct key *keyring,
if (index_key->type == &key_type_keyring)
up_write(&keyring_serialise_link_sem);
- if (edit) {
+ if (edit && !edit->dead_leaf) {
key_payload_reserve(keyring,
keyring->datalen - KEYQUOTA_LINK_BYTES);
assoc_array_cancel_edit(edit);
@@ -1243,6 +1245,7 @@ int key_unlink(struct key *keyring, struct key *key)
goto error;
assoc_array_apply_edit(edit);
+ key_payload_reserve(keyring, keyring->datalen - KEYQUOTA_LINK_BYTES);
ret = 0;
error: