From: Olivier Matz Date: Wed, 6 Apr 2016 13:27:59 +0000 (+0200) Subject: hash: fix allocation of an existing object X-Git-Tag: spdx-start~7065 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=1aadacb5b0ed29ea8f84eaa3ef6802663671be98;p=dpdk.git hash: fix allocation of an existing object Change rte_hash*_create() functions to return NULL and set rte_errno to EEXIST when the object name already exists. This is the behavior described in the API documentation in the header file. These functions were returning a pointer to the existing object in that case, but it is a problem as the caller did not know if the object had to be freed or not. Doing this change also makes the hash API more consistent with the other APIs (mempool, rings, ...). Fixes: 916e4f4f4e ("memory: fix for multi process support") Signed-off-by: Olivier Matz Acked-by: Pablo de Lara --- diff --git a/app/test/test_hash.c b/app/test/test_hash.c index 2f3d884ea2..adbdb4a820 100644 --- a/app/test/test_hash.c +++ b/app/test/test_hash.c @@ -805,15 +805,11 @@ fbk_hash_unit_test(void) RETURN_IF_ERROR_FBK(handle == NULL, "fbk hash creation should have succeeded"); tmp = rte_fbk_hash_create(&invalid_params_same_name_2); - RETURN_IF_ERROR_FBK(tmp == NULL, "fbk hash creation should have succeeded"); - if (tmp != handle) { - printf("ERROR line %d: hashes should have been the same\n", __LINE__); - rte_fbk_hash_free(handle); - rte_fbk_hash_free(tmp); - return -1; - } + if (tmp != NULL) + rte_fbk_hash_free(tmp); + RETURN_IF_ERROR_FBK(tmp != NULL, "fbk hash creation should have failed"); - /* we are not freeing tmp or handle here because we need a hash list + /* we are not freeing handle here because we need a hash list * to be not empty for the next test */ /* create a hash in non-empty list - good for coverage */ @@ -988,7 +984,7 @@ static int test_fbk_hash_find_existing(void) */ static int test_hash_creation_with_bad_parameters(void) { - struct rte_hash *handle; + struct rte_hash *handle, *tmp; struct rte_hash_parameters params; handle = rte_hash_create(NULL); @@ -1038,7 +1034,23 @@ static int test_hash_creation_with_bad_parameters(void) return -1; } + /* test with same name should fail */ + memcpy(¶ms, &ut_params, sizeof(params)); + params.name = "same_name"; + handle = rte_hash_create(¶ms); + if (handle == NULL) { + printf("Cannot create first hash table with 'same_name'\n"); + return -1; + } + tmp = rte_hash_create(¶ms); + if (tmp != NULL) { + printf("Creation of hash table with same name should fail\n"); + rte_hash_free(handle); + rte_hash_free(tmp); + return -1; + } rte_hash_free(handle); + printf("# Test successful. No more errors expected\n"); return 0; @@ -1051,12 +1063,12 @@ static int test_hash_creation_with_bad_parameters(void) static int test_hash_creation_with_good_parameters(void) { - struct rte_hash *handle, *tmp; + struct rte_hash *handle; struct rte_hash_parameters params; /* create with null hash function - should choose DEFAULT_HASH_FUNC */ memcpy(¶ms, &ut_params, sizeof(params)); - params.name = "same_name"; + params.name = "name"; params.hash_func = NULL; handle = rte_hash_create(¶ms); if (handle == NULL) { @@ -1064,37 +1076,6 @@ test_hash_creation_with_good_parameters(void) return -1; } - /* this test is trying to create a hash with the same name as previous one. - * this should return a pointer to the hash we previously created. - * the previous hash isn't freed exactly for the purpose of it being in - * the hash list. - */ - memcpy(¶ms, &ut_params, sizeof(params)); - params.name = "same_name"; - tmp = rte_hash_create(¶ms); - - /* check if the returned handle is actually equal to the previous hash */ - if (handle != tmp) { - rte_hash_free(handle); - rte_hash_free(tmp); - printf("Creating hash with existing name was successful\n"); - return -1; - } - - /* try creating hash when there already are hashes in the list. - * the previous hash is not freed to have a non-empty hash list. - * the other hash that's in the list is still pointed to by "handle" var. - */ - memcpy(¶ms, &ut_params, sizeof(params)); - params.name = "different_name"; - tmp = rte_hash_create(¶ms); - if (tmp == NULL) { - rte_hash_free(handle); - printf("Creating hash with valid parameters failed\n"); - return -1; - } - - rte_hash_free(tmp); rte_hash_free(handle); return 0; diff --git a/doc/guides/rel_notes/release_16_04.rst b/doc/guides/rel_notes/release_16_04.rst index b0f3dbabf4..e2939608f0 100644 --- a/doc/guides/rel_notes/release_16_04.rst +++ b/doc/guides/rel_notes/release_16_04.rst @@ -434,6 +434,15 @@ Libraries however a custom compare function (not in the jump table) can only be used in single-process mode. +* **hash: Fixed return value when allocating an existing hash table.** + + Changed the ``rte_hash*_create()`` functions to return ``NULL`` and set + ``rte_errno`` to ``EEXIST`` when the object name already exists. This is + the behavior described in the API documentation in the header file. + The previous behavior was to return a pointer to the existing object in + that case, preventing the caller to know if the object had to be freed + or not. + * **lpm: Fixed return value when allocating an existing object.** Changed the ``rte_lpm*_create()`` functions to return ``NULL`` and set diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c index 04e95b7323..b00cc12428 100644 --- a/lib/librte_hash/rte_cuckoo_hash.c +++ b/lib/librte_hash/rte_cuckoo_hash.c @@ -299,8 +299,10 @@ rte_hash_create(const struct rte_hash_parameters *params) /* Guarantee there's no existing */ h = rte_hash_find_existing(params->name); - if (h != NULL) - return h; + if (h != NULL) { + rte_errno = EEXIST; + return NULL; + } te = rte_zmalloc("HASH_TAILQ_ENTRY", sizeof(*te), 0); if (te == NULL) { diff --git a/lib/librte_hash/rte_fbk_hash.c b/lib/librte_hash/rte_fbk_hash.c index 8752a477e9..55c9f35831 100644 --- a/lib/librte_hash/rte_fbk_hash.c +++ b/lib/librte_hash/rte_fbk_hash.c @@ -140,8 +140,11 @@ rte_fbk_hash_create(const struct rte_fbk_hash_params *params) if (strncmp(params->name, ht->name, RTE_FBK_HASH_NAMESIZE) == 0) break; } - if (te != NULL) + ht = NULL; + if (te != NULL) { + rte_errno = EEXIST; goto exit; + } te = rte_zmalloc("FBK_HASH_TAILQ_ENTRY", sizeof(*te), 0); if (te == NULL) {