[PATCH v1 4/5] examples/fips_validation: fix buffer size to parse JSON string

[Gowrishankar Muthukrishnan]

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 <gmuthukri...@marvell.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 4732341dd3..926fe94563 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