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a383083194
Fully assume that the method constructors use reference counting. Otherwise, we may leak memory, or loose track and do a double free. Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8341)
106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/*
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* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stddef.h>
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#include <openssl/core.h>
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#include "internal/cryptlib.h"
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#include "internal/core.h"
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#include "internal/property.h"
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#include "internal/provider.h"
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struct construct_data_st {
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OPENSSL_CTX *libctx;
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OSSL_METHOD_STORE *store;
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int operation_id;
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int force_store;
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OSSL_METHOD_CONSTRUCT_METHOD *mcm;
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void *mcm_data;
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};
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static int ossl_method_construct_this(OSSL_PROVIDER *provider, void *cbdata)
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{
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struct construct_data_st *data = cbdata;
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int no_store = 0; /* Assume caching is ok */
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const OSSL_ALGORITHM *map =
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ossl_provider_query_operation(provider, data->operation_id, &no_store);
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while (map->algorithm_name != NULL) {
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const OSSL_ALGORITHM *thismap = map++;
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void *method = NULL;
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if ((method = data->mcm->construct(thismap->implementation, provider,
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data->mcm_data)) == NULL)
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continue;
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/*
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* Note regarding putting the method in stores:
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*
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* we don't need to care if it actually got in or not here.
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* If it didn't get in, it will simply not be available when
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* ossl_method_construct() tries to get it from the store.
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*
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* It is *expected* that the put function increments the refcnt
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* of the passed method.
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*/
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if (data->force_store || !no_store) {
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/*
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* If we haven't been told not to store,
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* add to the global store
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*/
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data->mcm->put(data->libctx, NULL,
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thismap->property_definition,
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method, data->mcm_data);
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}
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data->mcm->put(data->libctx, data->store,
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thismap->property_definition,
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method, data->mcm_data);
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/* refcnt-- because we're dropping the reference */
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data->mcm->destruct(method, data->mcm_data);
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}
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return 1;
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}
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void *ossl_method_construct(OPENSSL_CTX *libctx, int operation_id,
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const char *name, const char *propquery,
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int force_store,
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OSSL_METHOD_CONSTRUCT_METHOD *mcm, void *mcm_data)
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{
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void *method = NULL;
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if ((method = mcm->get(libctx, NULL, propquery, mcm_data)) == NULL) {
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struct construct_data_st cbdata;
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/*
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* We have a temporary store to be able to easily search among new
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* items, or items that should find themselves in the global store.
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*/
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if ((cbdata.store = mcm->alloc_tmp_store()) == NULL)
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goto fin;
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cbdata.libctx = libctx;
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cbdata.operation_id = operation_id;
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cbdata.force_store = force_store;
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cbdata.mcm = mcm;
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cbdata.mcm_data = mcm_data;
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ossl_provider_forall_loaded(libctx, ossl_method_construct_this,
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&cbdata);
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method = mcm->get(libctx, cbdata.store, propquery, mcm_data);
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mcm->dealloc_tmp_store(cbdata.store);
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}
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fin:
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return method;
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}
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