[v2 4/7] examples/fips_validation: fix buffer size to parse JSON string

[Gowrishankar Muthukrishnan <gmuthukrishn@marvell.com>]

In asym op, while parsing test interim info, existing buffer of size
256 bytes is not sufficient, hence setting it to maximum that a test
would need.

Fixes: 58cc98801eb ("examples/fips_validation: add JSON parsing")

Signed-off-by: Gowrishankar Muthukrishnan <gmuthukrishn@marvell.com>
Acked-by: Brian Dooley <brian.dooley@intel.com>
---
 examples/fips_validation/fips_validation.c | 7 ++++---
 examples/fips_validation/fips_validation.h | 7 +++++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/examples/fips_validation/fips_validation.c b/examples/fips_validation/fips_validation.c
index e755654cd0..be0634c3ac 100644
--- a/examples/fips_validation/fips_validation.c
+++ b/examples/fips_validation/fips_validation.c
@@ -484,7 +484,7 @@ fips_test_parse_one_json_group(void)
 	json_t *param;
 
 	if (info.interim_callbacks) {
-		char json_value[256];
+		char json_value[FIPS_TEST_JSON_BUF_LEN];
 		for (i = 0; info.interim_callbacks[i].key != NULL; i++) {
 			param = json_object_get(json_info.json_test_group,
 					info.interim_callbacks[i].key);
@@ -493,11 +493,12 @@ fips_test_parse_one_json_group(void)
 
 			switch (json_typeof(param)) {
 			case JSON_STRING:
-				snprintf(json_value, 256, "%s", json_string_value(param));
+				snprintf(json_value, sizeof(json_value), "%s",
+						 json_string_value(param));
 				break;
 
 			case JSON_INTEGER:
-				snprintf(json_value, 255, "%"JSON_INTEGER_FORMAT,
+				snprintf(json_value, sizeof(json_value), "%"JSON_INTEGER_FORMAT,
 						json_integer_value(param));
 				break;
 
diff --git a/examples/fips_validation/fips_validation.h b/examples/fips_validation/fips_validation.h
index 6e5f2fce75..43e5ffe4b0 100644
--- a/examples/fips_validation/fips_validation.h
+++ b/examples/fips_validation/fips_validation.h
@@ -183,6 +183,13 @@ struct xts_interim_data {
 };
 
 #ifdef USE_JANSSON
+/*
+ * Maximum length of buffer to hold any json string.
+ * Esp, in asym op, modulo bits decide char buffer size.
+ * max = (modulo / 4)
+ */
+#define FIPS_TEST_JSON_BUF_LEN (4096 / 4)
+
 struct fips_test_json_info {
 	/* Information used for reading from json */
 	json_t *json_root;
-- 
2.25.1