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mirror of https://github.com/DaveGamble/cJSON synced 2024-12-27 00:52:03 +00:00

Merge pull request #183 from FSMaxB/null-pointer-fixes

Null pointer fixes
This commit is contained in:
Max Bruckner 2017-06-28 16:13:56 +02:00 committed by GitHub
commit 48eaecd172
5 changed files with 266 additions and 25 deletions

79
cJSON.c
View File

@ -1111,6 +1111,7 @@ CJSON_PUBLIC(char *) cJSON_PrintBuffered(const cJSON *item, int prebuffer, cJSON
if (!print_value(item, &p))
{
global_hooks.deallocate(p.buffer);
return NULL;
}
@ -1121,7 +1122,7 @@ CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON *item, char *buf, const i
{
printbuffer p = { 0, 0, 0, 0, 0, 0, { 0, 0, 0 } };
if (len < 0)
if ((len < 0) || (buf == NULL))
{
return false;
}
@ -1652,17 +1653,25 @@ static cJSON_bool print_object(const cJSON * const item, printbuffer * const out
/* Get Array size/item / object item. */
CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array)
{
cJSON *c = array->child;
size_t i = 0;
while(c)
cJSON *child = NULL;
size_t size = 0;
if (array == NULL)
{
i++;
c = c->next;
return 0;
}
child = array->child;
while(child != NULL)
{
size++;
child = child->next;
}
/* FIXME: Can overflow here. Cannot be fixed without breaking the API */
return (int)i;
return (int)size;
}
static cJSON* get_array_item(const cJSON *array, size_t index)
@ -1747,16 +1756,23 @@ static void suffix_object(cJSON *prev, cJSON *item)
/* Utility for handling references. */
static cJSON *create_reference(const cJSON *item, const internal_hooks * const hooks)
{
cJSON *ref = cJSON_New_Item(hooks);
if (!ref)
cJSON *reference = NULL;
if (item == NULL)
{
return NULL;
}
memcpy(ref, item, sizeof(cJSON));
ref->string = NULL;
ref->type |= cJSON_IsReference;
ref->next = ref->prev = NULL;
return ref;
reference = cJSON_New_Item(hooks);
if (reference == NULL)
{
return NULL;
}
memcpy(reference, item, sizeof(cJSON));
reference->string = NULL;
reference->type |= cJSON_IsReference;
reference->next = reference->prev = NULL;
return reference;
}
/* Add item to array/object. */
@ -1789,6 +1805,11 @@ CJSON_PUBLIC(void) cJSON_AddItemToArray(cJSON *array, cJSON *item)
CJSON_PUBLIC(void) cJSON_AddItemToObject(cJSON *object, const char *string, cJSON *item)
{
if (item == NULL)
{
return;
}
/* call cJSON_AddItemToObjectCS for code reuse */
cJSON_AddItemToObjectCS(object, (char*)cJSON_strdup((const unsigned char*)string, &global_hooks), item);
/* remove cJSON_StringIsConst flag */
@ -1805,7 +1826,7 @@ CJSON_PUBLIC(void) cJSON_AddItemToObject(cJSON *object, const char *string, cJSO
/* Add an item to an object with constant string as key */
CJSON_PUBLIC(void) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJSON *item)
{
if (!item)
if ((item == NULL) || (string == NULL))
{
return;
}
@ -1823,11 +1844,21 @@ CJSON_PUBLIC(void) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJ
CJSON_PUBLIC(void) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item)
{
if (array == NULL)
{
return;
}
cJSON_AddItemToArray(array, create_reference(item, &global_hooks));
}
CJSON_PUBLIC(void) cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item)
{
if ((object == NULL) || (string == NULL))
{
return;
}
cJSON_AddItemToObject(object, string, create_reference(item, &global_hooks));
}
@ -1932,7 +1963,7 @@ CJSON_PUBLIC(void) cJSON_InsertItemInArray(cJSON *array, int which, cJSON *newit
CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON * const parent, cJSON * const item, cJSON * replacement)
{
if ((parent == NULL) || (replacement == NULL))
if ((parent == NULL) || (replacement == NULL) || (item == NULL))
{
return false;
}
@ -1977,7 +2008,7 @@ CJSON_PUBLIC(void) cJSON_ReplaceItemInArray(cJSON *array, int which, cJSON *newi
static cJSON_bool replace_item_in_object(cJSON *object, const char *string, cJSON *replacement, cJSON_bool case_sensitive)
{
if (replacement == NULL)
if ((replacement == NULL) || (string == NULL))
{
return false;
}
@ -2140,7 +2171,7 @@ CJSON_PUBLIC(cJSON *) cJSON_CreateIntArray(const int *numbers, int count)
cJSON *p = NULL;
cJSON *a = NULL;
if (count < 0)
if ((count < 0) || (numbers == NULL))
{
return NULL;
}
@ -2175,7 +2206,7 @@ CJSON_PUBLIC(cJSON *) cJSON_CreateFloatArray(const float *numbers, int count)
cJSON *p = NULL;
cJSON *a = NULL;
if (count < 0)
if ((count < 0) || (numbers == NULL))
{
return NULL;
}
@ -2211,7 +2242,7 @@ CJSON_PUBLIC(cJSON *) cJSON_CreateDoubleArray(const double *numbers, int count)
cJSON *p = NULL;
cJSON *a = NULL;
if (count < 0)
if ((count < 0) || (numbers == NULL))
{
return NULL;
}
@ -2247,7 +2278,7 @@ CJSON_PUBLIC(cJSON *) cJSON_CreateStringArray(const char **strings, int count)
cJSON *p = NULL;
cJSON *a = NULL;
if (count < 0)
if ((count < 0) || (strings == NULL))
{
return NULL;
}
@ -2359,6 +2390,12 @@ fail:
CJSON_PUBLIC(void) cJSON_Minify(char *json)
{
unsigned char *into = (unsigned char*)json;
if (json == NULL)
{
return;
}
while (*json)
{
if (*json == ' ')

View File

@ -162,6 +162,11 @@ CJSON_PUBLIC(char *) cJSONUtils_FindPointerFromObjectTo(const cJSON * const obje
size_t child_index = 0;
cJSON *current_child = 0;
if ((object == NULL) || (target == NULL))
{
return NULL;
}
if (object == target)
{
/* found */
@ -257,6 +262,12 @@ static cJSON_bool decode_array_index_from_pointer(const unsigned char * const po
static cJSON *get_item_from_pointer(cJSON * const object, const char * pointer, const cJSON_bool case_sensitive)
{
cJSON *current_element = object;
if (pointer == NULL)
{
return NULL;
}
/* follow path of the pointer */
while ((pointer[0] == '/') && (current_element != NULL))
{
@ -539,6 +550,10 @@ static cJSON *sort_list(cJSON *list, const cJSON_bool case_sensitive)
static void sort_object(cJSON * const object, const cJSON_bool case_sensitive)
{
if (object == NULL)
{
return;
}
object->child = sort_list(object->child, case_sensitive);
}
@ -1028,7 +1043,14 @@ CJSON_PUBLIC(int) cJSONUtils_ApplyPatchesCaseSensitive(cJSON * const object, con
static void compose_patch(cJSON * const patches, const unsigned char * const operation, const unsigned char * const path, const unsigned char *suffix, const cJSON * const value)
{
cJSON *patch = cJSON_CreateObject();
cJSON *patch = NULL;
if ((patches == NULL) || (operation == NULL) || (path == NULL))
{
return;
}
patch = cJSON_CreateObject();
if (patch == NULL)
{
return;
@ -1206,7 +1228,14 @@ static void create_patches(cJSON * const patches, const unsigned char * const pa
CJSON_PUBLIC(cJSON *) cJSONUtils_GeneratePatches(cJSON * const from, cJSON * const to)
{
cJSON *patches = cJSON_CreateArray();
cJSON *patches = NULL;
if ((from == NULL) || (to == NULL))
{
return NULL;
}
patches = cJSON_CreateArray();
create_patches(patches, (const unsigned char*)"", from, to, false);
return patches;
@ -1214,7 +1243,14 @@ CJSON_PUBLIC(cJSON *) cJSONUtils_GeneratePatches(cJSON * const from, cJSON * con
CJSON_PUBLIC(cJSON *) cJSONUtils_GeneratePatchesCaseSensitive(cJSON * const from, cJSON * const to)
{
cJSON *patches = cJSON_CreateArray();
cJSON *patches = NULL;
if ((from == NULL) || (to == NULL))
{
return NULL;
}
patches = cJSON_CreateArray();
create_patches(patches, (const unsigned char*)"", from, to, true);
return patches;

View File

@ -84,7 +84,8 @@ if(ENABLE_CJSON_TEST)
set (cjson_utils_tests
json_patch_tests
old_utils_tests)
old_utils_tests
misc_utils_tests)
foreach (cjson_utils_test ${cjson_utils_tests})
add_executable("${cjson_utils_test}" "${cjson_utils_test}.c")

View File

@ -324,6 +324,92 @@ static void cjson_replace_item_in_object_should_preserve_name(void)
cJSON_Delete(replacement);
}
static void cjson_functions_shouldnt_crash_with_null_pointers(void)
{
char buffer[10];
cJSON *item = cJSON_CreateString("item");
cJSON_InitHooks(NULL);
TEST_ASSERT_NULL(cJSON_Parse(NULL));
TEST_ASSERT_NULL(cJSON_ParseWithOpts(NULL, NULL, true));
TEST_ASSERT_NULL(cJSON_Print(NULL));
TEST_ASSERT_NULL(cJSON_PrintUnformatted(NULL));
TEST_ASSERT_NULL(cJSON_PrintBuffered(NULL, 10, true));
TEST_ASSERT_FALSE(cJSON_PrintPreallocated(NULL, buffer, sizeof(buffer), true));
TEST_ASSERT_FALSE(cJSON_PrintPreallocated(item, NULL, 1, true));
cJSON_Delete(NULL);
cJSON_GetArraySize(NULL);
TEST_ASSERT_NULL(cJSON_GetArrayItem(NULL, 0));
TEST_ASSERT_NULL(cJSON_GetObjectItem(NULL, "item"));
TEST_ASSERT_NULL(cJSON_GetObjectItem(item, NULL));
TEST_ASSERT_NULL(cJSON_GetObjectItemCaseSensitive(NULL, "item"));
TEST_ASSERT_NULL(cJSON_GetObjectItemCaseSensitive(item, NULL));
TEST_ASSERT_FALSE(cJSON_HasObjectItem(NULL, "item"));
TEST_ASSERT_FALSE(cJSON_HasObjectItem(item, NULL));
TEST_ASSERT_FALSE(cJSON_IsInvalid(NULL));
TEST_ASSERT_FALSE(cJSON_IsFalse(NULL));
TEST_ASSERT_FALSE(cJSON_IsTrue(NULL));
TEST_ASSERT_FALSE(cJSON_IsBool(NULL));
TEST_ASSERT_FALSE(cJSON_IsNull(NULL));
TEST_ASSERT_FALSE(cJSON_IsNumber(NULL));
TEST_ASSERT_FALSE(cJSON_IsString(NULL));
TEST_ASSERT_FALSE(cJSON_IsArray(NULL));
TEST_ASSERT_FALSE(cJSON_IsObject(NULL));
TEST_ASSERT_FALSE(cJSON_IsRaw(NULL));
TEST_ASSERT_NULL(cJSON_CreateString(NULL));
TEST_ASSERT_NULL(cJSON_CreateRaw(NULL));
TEST_ASSERT_NULL(cJSON_CreateIntArray(NULL, 10));
TEST_ASSERT_NULL(cJSON_CreateFloatArray(NULL, 10));
TEST_ASSERT_NULL(cJSON_CreateDoubleArray(NULL, 10));
TEST_ASSERT_NULL(cJSON_CreateStringArray(NULL, 10));
cJSON_AddItemToArray(NULL, item);
cJSON_AddItemToArray(item, NULL);
cJSON_AddItemToObject(item, "item", NULL);
cJSON_AddItemToObject(item, NULL, item);
cJSON_AddItemToObject(NULL, "item", item);
cJSON_AddItemToObjectCS(item, "item", NULL);
cJSON_AddItemToObjectCS(item, NULL, item);
cJSON_AddItemToObjectCS(NULL, "item", item);
cJSON_AddItemReferenceToArray(NULL, item);
cJSON_AddItemReferenceToArray(item, NULL);
cJSON_AddItemReferenceToObject(item, "item", NULL);
cJSON_AddItemReferenceToObject(item, NULL, item);
cJSON_AddItemReferenceToObject(NULL, "item", item);
TEST_ASSERT_NULL(cJSON_DetachItemViaPointer(NULL, item));
TEST_ASSERT_NULL(cJSON_DetachItemViaPointer(item, NULL));
TEST_ASSERT_NULL(cJSON_DetachItemFromArray(NULL, 0));
cJSON_DeleteItemFromArray(NULL, 0);
TEST_ASSERT_NULL(cJSON_DetachItemFromObject(NULL, "item"));
TEST_ASSERT_NULL(cJSON_DetachItemFromObject(item, NULL));
TEST_ASSERT_NULL(cJSON_DetachItemFromObjectCaseSensitive(NULL, "item"));
TEST_ASSERT_NULL(cJSON_DetachItemFromObjectCaseSensitive(item, NULL));
cJSON_DeleteItemFromObject(NULL, "item");
cJSON_DeleteItemFromObject(item, NULL);
cJSON_DeleteItemFromObjectCaseSensitive(NULL, "item");
cJSON_DeleteItemFromObjectCaseSensitive(item, NULL);
cJSON_InsertItemInArray(NULL, 0, item);
cJSON_InsertItemInArray(item, 0, NULL);
TEST_ASSERT_FALSE(cJSON_ReplaceItemViaPointer(NULL, item, item));
TEST_ASSERT_FALSE(cJSON_ReplaceItemViaPointer(item, NULL, item));
TEST_ASSERT_FALSE(cJSON_ReplaceItemViaPointer(item, item, NULL));
cJSON_ReplaceItemInArray(item, 0, NULL);
cJSON_ReplaceItemInArray(NULL, 0, item);
cJSON_ReplaceItemInObject(NULL, "item", item);
cJSON_ReplaceItemInObject(item, NULL, item);
cJSON_ReplaceItemInObject(item, "item", NULL);
cJSON_ReplaceItemInObjectCaseSensitive(NULL, "item", item);
cJSON_ReplaceItemInObjectCaseSensitive(item, NULL, item);
cJSON_ReplaceItemInObjectCaseSensitive(item, "item", NULL);
TEST_ASSERT_NULL(cJSON_Duplicate(NULL, true));
TEST_ASSERT_FALSE(cJSON_Compare(item, NULL, false));
TEST_ASSERT_FALSE(cJSON_Compare(NULL, item, false));
cJSON_Minify(NULL);
/* skipped because it is only used via a macro that checks for NULL */
/* cJSON_SetNumberHelper(NULL, 0); */
cJSON_Delete(item);
}
int main(void)
{
UNITY_BEGIN();
@ -338,6 +424,7 @@ int main(void)
RUN_TEST(cjson_detach_item_via_pointer_should_detach_items);
RUN_TEST(cjson_replace_item_via_pointer_should_replace_items);
RUN_TEST(cjson_replace_item_in_object_should_preserve_name);
RUN_TEST(cjson_functions_shouldnt_crash_with_null_pointers);
return UNITY_END();
}

80
tests/misc_utils_tests.c Normal file
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@ -0,0 +1,80 @@
/*
Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "unity/examples/unity_config.h"
#include "unity/src/unity.h"
#include "common.h"
#include "../cJSON_Utils.h"
static void cjson_utils_functions_shouldnt_crash_with_null_pointers(void)
{
cJSON *item = cJSON_CreateString("item");
TEST_ASSERT_NOT_NULL(item);
TEST_ASSERT_NULL(cJSONUtils_GetPointer(item, NULL));
TEST_ASSERT_NULL(cJSONUtils_GetPointer(NULL, "pointer"));
TEST_ASSERT_NULL(cJSONUtils_GetPointerCaseSensitive(NULL, "pointer"));
TEST_ASSERT_NULL(cJSONUtils_GetPointerCaseSensitive(item, NULL));
TEST_ASSERT_NULL(cJSONUtils_GeneratePatches(item, NULL));
TEST_ASSERT_NULL(cJSONUtils_GeneratePatches(NULL, item));
TEST_ASSERT_NULL(cJSONUtils_GeneratePatchesCaseSensitive(item, NULL));
TEST_ASSERT_NULL(cJSONUtils_GeneratePatchesCaseSensitive(NULL, item));
cJSONUtils_AddPatchToArray(item, "path", "add", NULL);
cJSONUtils_AddPatchToArray(item, "path", NULL, item);
cJSONUtils_AddPatchToArray(item, NULL, "add", item);
cJSONUtils_AddPatchToArray(NULL, "path", "add", item);
cJSONUtils_ApplyPatches(item, NULL);
cJSONUtils_ApplyPatches(NULL, item);
cJSONUtils_ApplyPatchesCaseSensitive(item, NULL);
cJSONUtils_ApplyPatchesCaseSensitive(NULL, item);
TEST_ASSERT_NULL(cJSONUtils_MergePatch(item, NULL));
item = cJSON_CreateString("item");
TEST_ASSERT_NULL(cJSONUtils_MergePatchCaseSensitive(item, NULL));
item = cJSON_CreateString("item");
/* these calls are actually valid */
/* cJSONUtils_MergePatch(NULL, item); */
/* cJSONUtils_MergePatchCaseSensitive(NULL, item);*/
/* cJSONUtils_GenerateMergePatch(item, NULL); */
/* cJSONUtils_GenerateMergePatch(NULL, item); */
/* cJSONUtils_GenerateMergePatchCaseSensitive(item, NULL); */
/* cJSONUtils_GenerateMergePatchCaseSensitive(NULL, item); */
TEST_ASSERT_NULL(cJSONUtils_FindPointerFromObjectTo(item, NULL));
TEST_ASSERT_NULL(cJSONUtils_FindPointerFromObjectTo(NULL, item));
cJSONUtils_SortObject(NULL);
cJSONUtils_SortObjectCaseSensitive(NULL);
cJSON_Delete(item);
}
int main(void)
{
UNITY_BEGIN();
RUN_TEST(cjson_utils_functions_shouldnt_crash_with_null_pointers);
return UNITY_END();
}