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Merge pull request #759 from c3h2-ctf/truncation 

json_tokener_parse_ex: handle out of memory errors
tags/json-c-0.17-20230812
Eric Hawicz GitHub 2 years ago
parent
4d529f92dc 9e6acc9a4e
commit
e9d3ab209a
No known key found for this signature in database GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 103 additions and 43 deletions
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  1. +102
    -43
      json_tokener.c
  2. +1
    -0
      json_tokener.h

+ 102
- 43
json_tokener.c View File

@@ -104,6 +104,7 @@ static const char *json_tokener_errors[] = {
"success", "success",
"continue", "continue",
"nesting too deep", "nesting too deep",
"out of memory",
"unexpected end of data", "unexpected end of data",
"unexpected character", "unexpected character",
"null expected", "null expected",
@@ -285,11 +286,24 @@ struct json_object *json_tokener_parse_verbose(const char *str, enum json_tokene


/* ADVANCE_CHAR() macro: /* ADVANCE_CHAR() macro:
* Increments str & tok->char_offset. * Increments str & tok->char_offset.
* For convenience of existing conditionals, returns the old value of c (0 on eof)
* For convenience of existing conditionals, returns the old value of c (0 on eof).
* Implicit inputs: c var * Implicit inputs: c var
*/ */
#define ADVANCE_CHAR(str, tok) (++(str), ((tok)->char_offset)++, c) #define ADVANCE_CHAR(str, tok) (++(str), ((tok)->char_offset)++, c)


/* printbuf_memappend_checked(p, s, l) macro:
* Add string s of length l to printbuffer p.
* If operation fails abort parse operation with memory error.
*/
#define printbuf_memappend_checked(p, s, l) \
do { \
if (printbuf_memappend((p), (s), (l)) < 0) \
{ \
tok->err = json_tokener_error_memory; \
goto out; \
} \
} while (0)

/* End optimization macro defs */ /* End optimization macro defs */


struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *str, int len) struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *str, int len)
@@ -337,7 +351,11 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
char *tmplocale; char *tmplocale;
tmplocale = setlocale(LC_NUMERIC, NULL); tmplocale = setlocale(LC_NUMERIC, NULL);
if (tmplocale) if (tmplocale)
{
oldlocale = strdup(tmplocale); oldlocale = strdup(tmplocale);
if (oldlocale == NULL)
return NULL;
}
setlocale(LC_NUMERIC, "C"); setlocale(LC_NUMERIC, "C");
} }
#endif #endif
@@ -359,7 +377,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
if (c == '/' && !(tok->flags & JSON_TOKENER_STRICT)) if (c == '/' && !(tok->flags & JSON_TOKENER_STRICT))
{ {
printbuf_reset(tok->pb); printbuf_reset(tok->pb);
printbuf_memappend_fast(tok->pb, &c, 1);
printbuf_memappend_checked(tok->pb, &c, 1);
state = json_tokener_state_comment_start; state = json_tokener_state_comment_start;
} }
else else
@@ -377,14 +395,20 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
saved_state = json_tokener_state_object_field_start; saved_state = json_tokener_state_object_field_start;
current = json_object_new_object(); current = json_object_new_object();
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
break; break;
case '[': case '[':
state = json_tokener_state_eatws; state = json_tokener_state_eatws;
saved_state = json_tokener_state_array; saved_state = json_tokener_state_array;
current = json_object_new_array(); current = json_object_new_array();
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
break; break;
case 'I': case 'I':
case 'i': case 'i':
@@ -487,7 +511,10 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
} }
current = json_object_new_double(is_negative ? -INFINITY : INFINITY); current = json_object_new_double(is_negative ? -INFINITY : INFINITY);
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
saved_state = json_tokener_state_finish; saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws; state = json_tokener_state_eatws;
goto redo_char; goto redo_char;
@@ -497,7 +524,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
int size; int size;
int size_nan; int size_nan;
printbuf_memappend_fast(tok->pb, &c, 1);
printbuf_memappend_checked(tok->pb, &c, 1);
size = json_min(tok->st_pos + 1, json_null_str_len); size = json_min(tok->st_pos + 1, json_null_str_len);
size_nan = json_min(tok->st_pos + 1, json_nan_str_len); size_nan = json_min(tok->st_pos + 1, json_nan_str_len);
if ((!(tok->flags & JSON_TOKENER_STRICT) && if ((!(tok->flags & JSON_TOKENER_STRICT) &&
@@ -520,7 +547,10 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
current = json_object_new_double(NAN); current = json_object_new_double(NAN);
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
saved_state = json_tokener_state_finish; saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws; state = json_tokener_state_eatws;
goto redo_char; goto redo_char;
@@ -549,7 +579,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
tok->err = json_tokener_error_parse_comment; tok->err = json_tokener_error_parse_comment;
goto out; goto out;
} }
printbuf_memappend_fast(tok->pb, &c, 1);
printbuf_memappend_checked(tok->pb, &c, 1);
break; break;


case json_tokener_state_comment: case json_tokener_state_comment:
@@ -560,12 +590,12 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok)) if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{ {
printbuf_memappend_fast(tok->pb, case_start,
str - case_start);
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
goto out; goto out;
} }
} }
printbuf_memappend_fast(tok->pb, case_start, 1 + str - case_start);
printbuf_memappend_checked(tok->pb, case_start, 1 + str - case_start);
state = json_tokener_state_comment_end; state = json_tokener_state_comment_end;
} }
break; break;
@@ -578,19 +608,19 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok)) if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{ {
printbuf_memappend_fast(tok->pb, case_start,
str - case_start);
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
goto out; goto out;
} }
} }
printbuf_memappend_fast(tok->pb, case_start, str - case_start);
printbuf_memappend_checked(tok->pb, case_start, str - case_start);
MC_DEBUG("json_tokener_comment: %s\n", tok->pb->buf); MC_DEBUG("json_tokener_comment: %s\n", tok->pb->buf);
state = json_tokener_state_eatws; state = json_tokener_state_eatws;
} }
break; break;


case json_tokener_state_comment_end: case json_tokener_state_comment_end:
printbuf_memappend_fast(tok->pb, &c, 1);
printbuf_memappend_checked(tok->pb, &c, 1);
if (c == '/') if (c == '/')
{ {
MC_DEBUG("json_tokener_comment: %s\n", tok->pb->buf); MC_DEBUG("json_tokener_comment: %s\n", tok->pb->buf);
@@ -610,28 +640,31 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
if (c == tok->quote_char) if (c == tok->quote_char)
{ {
printbuf_memappend_fast(tok->pb, case_start,
str - case_start);
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
current = current =
json_object_new_string_len(tok->pb->buf, tok->pb->bpos); json_object_new_string_len(tok->pb->buf, tok->pb->bpos);
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
saved_state = json_tokener_state_finish; saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws; state = json_tokener_state_eatws;
break; break;
} }
else if (c == '\\') else if (c == '\\')
{ {
printbuf_memappend_fast(tok->pb, case_start,
str - case_start);
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
saved_state = json_tokener_state_string; saved_state = json_tokener_state_string;
state = json_tokener_state_string_escape; state = json_tokener_state_string_escape;
break; break;
} }
if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok)) if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{ {
printbuf_memappend_fast(tok->pb, case_start,
str - case_start);
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
goto out; goto out;
} }
} }
@@ -644,7 +677,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
case '"': case '"':
case '\\': case '\\':
case '/': case '/':
printbuf_memappend_fast(tok->pb, &c, 1);
printbuf_memappend_checked(tok->pb, &c, 1);
state = saved_state; state = saved_state;
break; break;
case 'b': case 'b':
@@ -653,15 +686,15 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
case 't': case 't':
case 'f': case 'f':
if (c == 'b') if (c == 'b')
printbuf_memappend_fast(tok->pb, "\b", 1);
printbuf_memappend_checked(tok->pb, "\b", 1);
else if (c == 'n') else if (c == 'n')
printbuf_memappend_fast(tok->pb, "\n", 1);
printbuf_memappend_checked(tok->pb, "\n", 1);
else if (c == 'r') else if (c == 'r')
printbuf_memappend_fast(tok->pb, "\r", 1);
printbuf_memappend_checked(tok->pb, "\r", 1);
else if (c == 't') else if (c == 't')
printbuf_memappend_fast(tok->pb, "\t", 1);
printbuf_memappend_checked(tok->pb, "\t", 1);
else if (c == 'f') else if (c == 'f')
printbuf_memappend_fast(tok->pb, "\f", 1);
printbuf_memappend_checked(tok->pb, "\f", 1);
state = saved_state; state = saved_state;
break; break;
case 'u': case 'u':
@@ -721,8 +754,8 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
/* High surrogate was not followed by a low surrogate /* High surrogate was not followed by a low surrogate
* Replace the high and process the rest normally * Replace the high and process the rest normally
*/ */
printbuf_memappend_fast(tok->pb,
(char *)utf8_replacement_char, 3);
printbuf_memappend_checked(tok->pb,
(char *)utf8_replacement_char, 3);
} }
tok->high_surrogate = 0; tok->high_surrogate = 0;
} }
@@ -731,14 +764,14 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
unsigned char unescaped_utf[1]; unsigned char unescaped_utf[1];
unescaped_utf[0] = tok->ucs_char; unescaped_utf[0] = tok->ucs_char;
printbuf_memappend_fast(tok->pb, (char *)unescaped_utf, 1);
printbuf_memappend_checked(tok->pb, (char *)unescaped_utf, 1);
} }
else if (tok->ucs_char < 0x800) else if (tok->ucs_char < 0x800)
{ {
unsigned char unescaped_utf[2]; unsigned char unescaped_utf[2];
unescaped_utf[0] = 0xc0 | (tok->ucs_char >> 6); unescaped_utf[0] = 0xc0 | (tok->ucs_char >> 6);
unescaped_utf[1] = 0x80 | (tok->ucs_char & 0x3f); unescaped_utf[1] = 0x80 | (tok->ucs_char & 0x3f);
printbuf_memappend_fast(tok->pb, (char *)unescaped_utf, 2);
printbuf_memappend_checked(tok->pb, (char *)unescaped_utf, 2);
} }
else if (IS_HIGH_SURROGATE(tok->ucs_char)) else if (IS_HIGH_SURROGATE(tok->ucs_char))
{ {
@@ -764,7 +797,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
else if (IS_LOW_SURROGATE(tok->ucs_char)) else if (IS_LOW_SURROGATE(tok->ucs_char))
{ {
/* Got a low surrogate not preceded by a high */ /* Got a low surrogate not preceded by a high */
printbuf_memappend_fast(tok->pb, (char *)utf8_replacement_char, 3);
printbuf_memappend_checked(tok->pb, (char *)utf8_replacement_char, 3);
} }
else if (tok->ucs_char < 0x10000) else if (tok->ucs_char < 0x10000)
{ {
@@ -772,7 +805,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
unescaped_utf[0] = 0xe0 | (tok->ucs_char >> 12); unescaped_utf[0] = 0xe0 | (tok->ucs_char >> 12);
unescaped_utf[1] = 0x80 | ((tok->ucs_char >> 6) & 0x3f); unescaped_utf[1] = 0x80 | ((tok->ucs_char >> 6) & 0x3f);
unescaped_utf[2] = 0x80 | (tok->ucs_char & 0x3f); unescaped_utf[2] = 0x80 | (tok->ucs_char & 0x3f);
printbuf_memappend_fast(tok->pb, (char *)unescaped_utf, 3);
printbuf_memappend_checked(tok->pb, (char *)unescaped_utf, 3);
} }
else if (tok->ucs_char < 0x110000) else if (tok->ucs_char < 0x110000)
{ {
@@ -781,12 +814,12 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
unescaped_utf[1] = 0x80 | ((tok->ucs_char >> 12) & 0x3f); unescaped_utf[1] = 0x80 | ((tok->ucs_char >> 12) & 0x3f);
unescaped_utf[2] = 0x80 | ((tok->ucs_char >> 6) & 0x3f); unescaped_utf[2] = 0x80 | ((tok->ucs_char >> 6) & 0x3f);
unescaped_utf[3] = 0x80 | (tok->ucs_char & 0x3f); unescaped_utf[3] = 0x80 | (tok->ucs_char & 0x3f);
printbuf_memappend_fast(tok->pb, (char *)unescaped_utf, 4);
printbuf_memappend_checked(tok->pb, (char *)unescaped_utf, 4);
} }
else else
{ {
/* Don't know what we got--insert the replacement char */ /* Don't know what we got--insert the replacement char */
printbuf_memappend_fast(tok->pb, (char *)utf8_replacement_char, 3);
printbuf_memappend_checked(tok->pb, (char *)utf8_replacement_char, 3);
} }
state = saved_state; // i.e. _state_string or _state_object_field state = saved_state; // i.e. _state_string or _state_object_field
} }
@@ -801,7 +834,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
* it. Put a replacement char in for the high surrogate * it. Put a replacement char in for the high surrogate
* and pop back up to _state_string or _state_object_field. * and pop back up to _state_string or _state_object_field.
*/ */
printbuf_memappend_fast(tok->pb, (char *)utf8_replacement_char, 3);
printbuf_memappend_checked(tok->pb, (char *)utf8_replacement_char, 3);
tok->high_surrogate = 0; tok->high_surrogate = 0;
tok->ucs_char = 0; tok->ucs_char = 0;
tok->st_pos = 0; tok->st_pos = 0;
@@ -820,7 +853,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
* Put a replacement char in for the high surrogate * Put a replacement char in for the high surrogate
* and handle the escape sequence normally. * and handle the escape sequence normally.
*/ */
printbuf_memappend_fast(tok->pb, (char *)utf8_replacement_char, 3);
printbuf_memappend_checked(tok->pb, (char *)utf8_replacement_char, 3);
tok->high_surrogate = 0; tok->high_surrogate = 0;
tok->ucs_char = 0; tok->ucs_char = 0;
tok->st_pos = 0; tok->st_pos = 0;
@@ -835,7 +868,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
case json_tokener_state_boolean: case json_tokener_state_boolean:
{ {
int size1, size2; int size1, size2;
printbuf_memappend_fast(tok->pb, &c, 1);
printbuf_memappend_checked(tok->pb, &c, 1);
size1 = json_min(tok->st_pos + 1, json_true_str_len); size1 = json_min(tok->st_pos + 1, json_true_str_len);
size2 = json_min(tok->st_pos + 1, json_false_str_len); size2 = json_min(tok->st_pos + 1, json_false_str_len);
if ((!(tok->flags & JSON_TOKENER_STRICT) && if ((!(tok->flags & JSON_TOKENER_STRICT) &&
@@ -846,7 +879,10 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
current = json_object_new_boolean(1); current = json_object_new_boolean(1);
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
saved_state = json_tokener_state_finish; saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws; state = json_tokener_state_eatws;
goto redo_char; goto redo_char;
@@ -860,7 +896,10 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
current = json_object_new_boolean(0); current = json_object_new_boolean(0);
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
saved_state = json_tokener_state_finish; saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws; state = json_tokener_state_eatws;
goto redo_char; goto redo_char;
@@ -940,7 +979,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *


if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok)) if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{ {
printbuf_memappend_fast(tok->pb, case_start, case_len);
printbuf_memappend_checked(tok->pb, case_start, case_len);
goto out; goto out;
} }
} }
@@ -949,7 +988,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
it might have been intended to be, and return a potentially it might have been intended to be, and return a potentially
more understandable error right away. more understandable error right away.
However, if we're at the top-level, use the number as-is However, if we're at the top-level, use the number as-is
because c can be part of a new object to parse on the
because c can be part of a new object to parse on the
next call to json_tokener_parse(). next call to json_tokener_parse().
*/ */
if (tok->depth > 0 && c != ',' && c != ']' && c != '}' && c != '/' && if (tok->depth > 0 && c != ',' && c != ']' && c != '}' && c != '/' &&
@@ -959,7 +998,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
goto out; goto out;
} }
if (case_len > 0) if (case_len > 0)
printbuf_memappend_fast(tok->pb, case_start, case_len);
printbuf_memappend_checked(tok->pb, case_start, case_len);


// Check for -Infinity // Check for -Infinity
if (tok->pb->buf[0] == '-' && case_len <= 1 && (c == 'i' || c == 'I')) if (tok->pb->buf[0] == '-' && case_len <= 1 && (c == 'i' || c == 'I'))
@@ -999,7 +1038,10 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
} }
current = json_object_new_int64(num64); current = json_object_new_int64(num64);
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
} }
else if (!tok->is_double && tok->pb->buf[0] != '-' && else if (!tok->is_double && tok->pb->buf[0] != '-' &&
json_parse_uint64(tok->pb->buf, &numuint64) == 0) json_parse_uint64(tok->pb->buf, &numuint64) == 0)
@@ -1020,13 +1062,19 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
num64 = (uint64_t)numuint64; num64 = (uint64_t)numuint64;
current = json_object_new_int64(num64); current = json_object_new_int64(num64);
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
} }
else else
{ {
current = json_object_new_uint64(numuint64); current = json_object_new_uint64(numuint64);
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
} }
} }
else if (tok->is_double && else if (tok->is_double &&
@@ -1035,7 +1083,10 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
current = json_object_new_double_s(numd, tok->pb->buf); current = json_object_new_double_s(numd, tok->pb->buf);
if (current == NULL) if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
} }
else else
{ {
@@ -1080,7 +1131,10 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *


case json_tokener_state_array_add: case json_tokener_state_array_add:
if (json_object_array_add(current, obj) != 0) if (json_object_array_add(current, obj) != 0)
{
tok->err = json_tokener_error_memory;
goto out; goto out;
}
saved_state = json_tokener_state_array_sep; saved_state = json_tokener_state_array_sep;
state = json_tokener_state_eatws; state = json_tokener_state_eatws;
goto redo_char; goto redo_char;
@@ -1140,25 +1194,30 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
{ {
if (c == tok->quote_char) if (c == tok->quote_char)
{ {
printbuf_memappend_fast(tok->pb, case_start,
str - case_start);
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
obj_field_name = strdup(tok->pb->buf); obj_field_name = strdup(tok->pb->buf);
if (obj_field_name == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
saved_state = json_tokener_state_object_field_end; saved_state = json_tokener_state_object_field_end;
state = json_tokener_state_eatws; state = json_tokener_state_eatws;
break; break;
} }
else if (c == '\\') else if (c == '\\')
{ {
printbuf_memappend_fast(tok->pb, case_start,
str - case_start);
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
saved_state = json_tokener_state_object_field; saved_state = json_tokener_state_object_field;
state = json_tokener_state_string_escape; state = json_tokener_state_string_escape;
break; break;
} }
if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok)) if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{ {
printbuf_memappend_fast(tok->pb, case_start,
str - case_start);
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
goto out; goto out;
} }
} }


+ 1
- 0
json_tokener.h View File

@@ -28,6 +28,7 @@ enum json_tokener_error
json_tokener_success, json_tokener_success,
json_tokener_continue, json_tokener_continue,
json_tokener_error_depth, json_tokener_error_depth,
json_tokener_error_memory,
json_tokener_error_parse_eof, json_tokener_error_parse_eof,
json_tokener_error_parse_unexpected, json_tokener_error_parse_unexpected,
json_tokener_error_parse_null, json_tokener_error_parse_null,


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