fix: prevent NULL pointer dereference in cJSON_SetNumberHelper (#991)

Add NULL check at the beginning of cJSON_SetNumberHelper to prevent
segmentation fault when called with NULL object pointer. The function
now returns NAN (Not-a-Number) when object is NULL, consistent with
error handling patterns in other cJSON functions.

This fixes a Denial of Service vulnerability (CWE-476) where an
attacker could crash applications using the cJSON library by
triggering this function with a NULL pointer.

Changes:
- cJSON.c: Add NULL check in cJSON_SetNumberHelper
- tests/misc_tests.c: Add test case and math.h include

Security: Fixes NULL pointer dereference vulnerability

cJSON.c

@@ -410,6 +410,11 @@ loop_end:
 /* don't ask me, but the original cJSON_SetNumberValue returns an integer or double */
 CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON *object, double number)
 {
+    if (object == NULL)
+    {
+        return (double)NAN;
+    }
+
     if (number >= INT_MAX)
     {
         object->valueint = INT_MAX;

tests/misc_tests.c

@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>
 
 #include "unity/examples/unity_config.h"
 #include "unity/src/unity.h"
@@ -478,8 +479,8 @@ static void cjson_functions_should_not_crash_with_null_pointers(void)
     TEST_ASSERT_NULL(cJSON_SetValuestring(corruptedString, "test"));
     TEST_ASSERT_NULL(cJSON_SetValuestring(item, NULL));
     cJSON_Minify(NULL);
-    /* skipped because it is only used via a macro that checks for NULL */
+    /* cJSON_SetNumberHelper should handle NULL gracefully */
-    /* cJSON_SetNumberHelper(NULL, 0); */
+    TEST_ASSERT_TRUE(isnan(cJSON_SetNumberHelper(NULL, 0)));
 
     /* restore corrupted item2 to delete it */
     item2->prev = originalPrev;