[PATCH v2] cryptodev: avoid algorithm strings null pointers

["xixin.liu" <liuxixin2020@outlook.com>]

The crypto algorithm strings identifiers that are Continuous may be null,
so there is needed to add null judgment.
When testing with dpdk-test-crypto-perf and passing in the parameter
--auth-algo sm3-hmac, The program caused a segfault due to a null pointer
passed in by strcmp.
Adding this patch can solve the segfault problem.

Signed-off-by: xixin.liu <liuxixin2020@outlook.com>
---
 lib/cryptodev/rte_cryptodev.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/cryptodev/rte_cryptodev.c b/lib/cryptodev/rte_cryptodev.c
index a96114b2da..41c23fc596 100644
--- a/lib/cryptodev/rte_cryptodev.c
+++ b/lib/cryptodev/rte_cryptodev.c
@@ -346,6 +346,8 @@ rte_cryptodev_get_cipher_algo_enum(enum rte_crypto_cipher_algorithm *algo_enum,
 	int ret = -1;	/* Invalid string */
 
 	for (i = 1; i < RTE_DIM(crypto_cipher_algorithm_strings); i++) {
+		if (crypto_cipher_algorithm_strings[i] == NULL)
+			continue;
 		if (strcmp(algo_string, crypto_cipher_algorithm_strings[i]) == 0) {
 			*algo_enum = (enum rte_crypto_cipher_algorithm) i;
 			ret = 0;
@@ -366,6 +368,8 @@ rte_cryptodev_get_auth_algo_enum(enum rte_crypto_auth_algorithm *algo_enum,
 	int ret = -1;	/* Invalid string */
 
 	for (i = 1; i < RTE_DIM(crypto_auth_algorithm_strings); i++) {
+		if (crypto_auth_algorithm_strings[i] == NULL)
+			continue;
 		if (strcmp(algo_string, crypto_auth_algorithm_strings[i]) == 0) {
 			*algo_enum = (enum rte_crypto_auth_algorithm) i;
 			ret = 0;
@@ -386,6 +390,8 @@ rte_cryptodev_get_aead_algo_enum(enum rte_crypto_aead_algorithm *algo_enum,
 	int ret = -1;	/* Invalid string */
 
 	for (i = 1; i < RTE_DIM(crypto_aead_algorithm_strings); i++) {
+		if (crypto_aead_algorithm_strings[i] == NULL)
+			continue;
 		if (strcmp(algo_string, crypto_aead_algorithm_strings[i]) == 0) {
 			*algo_enum = (enum rte_crypto_aead_algorithm) i;
 			ret = 0;
@@ -406,6 +412,8 @@ rte_cryptodev_asym_get_xform_enum(enum rte_crypto_asym_xform_type *xform_enum,
 	int ret = -1;	/* Invalid string */
 
 	for (i = 1; i < RTE_DIM(crypto_asym_xform_strings); i++) {
+		if (crypto_asym_xform_strings[i] == NULL)
+			continue;
 		if (strcmp(xform_string,
 			crypto_asym_xform_strings[i]) == 0) {
 			*xform_enum = (enum rte_crypto_asym_xform_type) i;
-- 
2.34.1