Commit 2b9e4688 authored by David Howells's avatar David Howells Committed by James Morris

KEYS: Better handling of errors from construct_alloc_key()

Errors from construct_alloc_key() shouldn't just be ignored in the way they are
by construct_key_and_link().  The only error that can be ignored so is
EINPROGRESS as that is used to indicate that we've found a key and don't need
to construct one.

We don't, however, handle ENOMEM, EDQUOT or EACCES to indicate allocation
failures of one sort or another.
Reported-by: default avatarVegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent 553d603c
......@@ -302,6 +302,7 @@ static int construct_alloc_key(struct key_type *type,
const struct cred *cred = current_cred();
struct key *key;
key_ref_t key_ref;
int ret;
kenter("%s,%s,,,", type->name, description);
......@@ -337,14 +338,23 @@ static int construct_alloc_key(struct key_type *type,
kleave(" = 0 [%d]", key_serial(key));
return 0;
/* the key is now present - we tell the caller that we found it by
* returning -EINPROGRESS */
key_already_present:
mutex_unlock(&key_construction_mutex);
ret = 0;
if (dest_keyring) {
__key_link(dest_keyring, key_ref_to_ptr(key_ref));
ret = __key_link(dest_keyring, key_ref_to_ptr(key_ref));
up_write(&dest_keyring->sem);
}
mutex_unlock(&user->cons_lock);
key_put(key);
if (ret < 0) {
key_ref_put(key_ref);
*_key = NULL;
kleave(" = %d [link]", ret);
return ret;
}
*_key = key = key_ref_to_ptr(key_ref);
kleave(" = -EINPROGRESS [%d]", key_serial(key));
return -EINPROGRESS;
......@@ -390,6 +400,10 @@ static struct key *construct_key_and_link(struct key_type *type,
kdebug("cons failed");
goto construction_failed;
}
} else if (ret == -EINPROGRESS) {
ret = 0;
} else {
key = ERR_PTR(ret);
}
key_put(dest_keyring);
......@@ -422,6 +436,7 @@ struct key *request_key_and_link(struct key_type *type,
const struct cred *cred = current_cred();
struct key *key;
key_ref_t key_ref;
int ret;
kenter("%s,%s,%p,%zu,%p,%p,%lx",
type->name, description, callout_info, callout_len, aux,
......@@ -435,8 +450,13 @@ struct key *request_key_and_link(struct key_type *type,
key = key_ref_to_ptr(key_ref);
if (dest_keyring) {
construct_get_dest_keyring(&dest_keyring);
key_link(dest_keyring, key);
ret = key_link(dest_keyring, key);
key_put(dest_keyring);
if (ret < 0) {
key_put(key);
key = ERR_PTR(ret);
goto error;
}
}
} else if (PTR_ERR(key_ref) != -EAGAIN) {
key = ERR_CAST(key_ref);
......
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