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Fix issue #875: cast to unsigned char so bytes above 0x7f aren't interpreted as negative, which was causing the strict-mode control characters check to incorrectly trigger.

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This commit is contained in:
Eric Hawicz
2024-11-08 22:20:40 -05:00
parent 474ee12435
commit 565f181f65
3 changed files with 26 additions and 8 deletions
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2
json_tokener.c
View File

@@ -678,7 +678,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
state = json_tokener_state_string_escape;
break;
}
else if ((tok->flags & JSON_TOKENER_STRICT) && c <= 0x1f)
else if ((tok->flags & JSON_TOKENER_STRICT) && (unsigned char)c <= 0x1f)
{
// Disallow control characters in strict mode
tok->err = json_tokener_error_parse_string;

19
tests/test_parse.c
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@@ -297,6 +297,7 @@ struct incremental_step
{"d", -1, -1, json_tokener_continue, 0, 0},
{"1", -1, -1, json_tokener_continue, 0, 0},
{"e\"", -1, -1, json_tokener_success, 1, 0},
/* parse two char at every time */
{"\"\\u", -1, -1, json_tokener_continue, 0, 0},
{"d8", -1, -1, json_tokener_continue, 0, 0},
@@ -322,6 +323,11 @@ struct incremental_step
{"\"fff \\ud83d\\ude", -1, -1, json_tokener_continue, 0, 0},
{"00 bar\"", -1, -1, json_tokener_success, 1, 0},
/* Check a utf-8 char (a+umlaut) that has bytes that look negative when
char are signed (see also control char check below) */
{"\"\xc3\xa4\"", -1, -1, json_tokener_success, 1, 0},
{"\"\xc3\xa4\"", -1, -1, json_tokener_success, 1, JSON_TOKENER_STRICT},
/* Check that json_tokener_reset actually resets */
{"{ \"foo", -1, -1, json_tokener_continue, 1, 0},
{": \"bar\"}", -1, 0, json_tokener_error_parse_unexpected, 1, 0},
@@ -394,8 +400,8 @@ struct incremental_step
{"Infinity", 9, 8, json_tokener_success, 1, 0},
{"infinity", 9, 8, json_tokener_success, 1, 0},
{"-infinity", 10, 9, json_tokener_success, 1, 0},
{"infinity", 9, 0, json_tokener_error_parse_unexpected, 1, JSON_TOKENER_STRICT},
{"-infinity", 10, 9, json_tokener_success, 1, 0},
{"-infinity", 10, 1, json_tokener_error_parse_unexpected, 1, JSON_TOKENER_STRICT},
{"inf", 3, 3, json_tokener_continue, 0, 0},
@@ -462,12 +468,15 @@ struct incremental_step
{"[18446744073709551616]", 23, 21, json_tokener_error_parse_number, 1, JSON_TOKENER_STRICT},
/* XXX this seems like a bug, should fail with _error_parse_number instead */
{"18446744073709551616", 21, 20, json_tokener_success, 1, 0},
{"18446744073709551616", 21, 20, json_tokener_error_parse_eof, 1, JSON_TOKENER_STRICT},
/* Exceeding integer limits as double parse OK */
{"[9223372036854775808.0]", 24, 23, json_tokener_success, 1, 0},
{"[-9223372036854775809.0]", 25, 24, json_tokener_success, 1, 0},
{"[-9223372036854775809.0]", 25, 24, json_tokener_success, 1, JSON_TOKENER_STRICT},
{"[18446744073709551615.0]", 25, 24, json_tokener_success, 1, 0},
{"[18446744073709551616.0]", 25, 24, json_tokener_success, 1, 0},
{"[18446744073709551616.0]", 25, 24, json_tokener_success, 1, JSON_TOKENER_STRICT},
/* offset=1 because "n" is the start of "null". hmm... */
@@ -524,6 +533,7 @@ struct incremental_step
{"\"\\a\"", -1, 2, json_tokener_error_parse_string, 1, 0},
/* Check '\'' in strict model */
{"\'foo\'", -1, 5, json_tokener_success, 1, 0},
{"\'foo\'", -1, 0, json_tokener_error_parse_unexpected, 1, JSON_TOKENER_STRICT},
/* Parse array/object */
@@ -544,9 +554,10 @@ struct incremental_step
* in what we accept (up to a point).
*/
{"[1,2,3,]", -1, -1, json_tokener_success, 0, 0},
{"[1,2,,3,]", -1, 5, json_tokener_error_parse_unexpected, 0, 0},
{"[1,2,3,]", -1, 7, json_tokener_error_parse_unexpected, 1, JSON_TOKENER_STRICT},
{"[1,2,,3,]", -1, 5, json_tokener_error_parse_unexpected, 0, 0},
{"[1,2,,3,]", -1, 5, json_tokener_error_parse_unexpected, 0, JSON_TOKENER_STRICT},
{"{\"a\":1,}", -1, 7, json_tokener_error_parse_unexpected, 1, JSON_TOKENER_STRICT},
// utf-8 test
@@ -656,7 +667,7 @@ static void test_incremental_parse(void)
printf("json_tokener_parse(%s) ... ", string_to_parse);
new_obj = json_tokener_parse(string_to_parse);
if (new_obj == NULL)
puts("got error as expected");
printf("%s", "got error as expected\n");
/* test incremental parsing in various forms */
tok = json_tokener_new();

13
tests/test_parse.expected
View File

@@ -134,6 +134,8 @@ json_tokener_parse_ex(tok, "fff \ud834\udd, 15) ... OK: got correct error: cont
json_tokener_parse_ex(tok, 1e bar" , 7) ... OK: got object of type [string]: "fff 𝄞 bar"
json_tokener_parse_ex(tok, "fff \ud83d\ude, 15) ... OK: got correct error: continue
json_tokener_parse_ex(tok, 00 bar" , 7) ... OK: got object of type [string]: "fff 😀 bar"
json_tokener_parse_ex(tok, "ä" , 4) ... OK: got object of type [string]: "ä"
json_tokener_parse_ex(tok, "ä" , 4) ... OK: got object of type [string]: "ä"
json_tokener_parse_ex(tok, { "foo , 6) ... OK: got correct error: continue
json_tokener_parse_ex(tok, : "bar"} , 8) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, { "foo , 6) ... OK: got correct error: continue
@@ -177,8 +179,8 @@ json_tokener_parse_ex(tok, null , 4) ... OK: got correct error: continu
json_tokener_parse_ex(tok, null , 5) ... OK: got object of type [null]: null
json_tokener_parse_ex(tok, Infinity , 9) ... OK: got object of type [double]: Infinity
json_tokener_parse_ex(tok, infinity , 9) ... OK: got object of type [double]: Infinity
json_tokener_parse_ex(tok, -infinity , 10) ... OK: got object of type [double]: -Infinity
json_tokener_parse_ex(tok, infinity , 9) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, -infinity , 10) ... OK: got object of type [double]: -Infinity
json_tokener_parse_ex(tok, -infinity , 10) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, inf , 3) ... OK: got correct error: continue
json_tokener_parse_ex(tok, inity , 6) ... OK: got object of type [double]: Infinity
@@ -218,11 +220,14 @@ json_tokener_parse_ex(tok, [-9223372036854775809], 23) ... OK: got correct erro
json_tokener_parse_ex(tok, [18446744073709551615], 23) ... OK: got object of type [array]: [ 18446744073709551615 ]
json_tokener_parse_ex(tok, [18446744073709551616], 23) ... OK: got object of type [array]: [ 18446744073709551615 ]
json_tokener_parse_ex(tok, [18446744073709551616], 23) ... OK: got correct error: number expected
json_tokener_parse_ex(tok, 18446744073709551616, 21) ... OK: got object of type [int]: 18446744073709551615
json_tokener_parse_ex(tok, 18446744073709551616, 21) ... OK: got correct error: unexpected end of data
json_tokener_parse_ex(tok, [9223372036854775808.0], 24) ... OK: got object of type [array]: [ 9223372036854775808.0 ]
json_tokener_parse_ex(tok, [-9223372036854775809.0], 25) ... OK: got object of type [array]: [ -9223372036854775809.0 ]
json_tokener_parse_ex(tok, [-9223372036854775809.0], 25) ... OK: got object of type [array]: [ -9223372036854775809.0 ]
json_tokener_parse_ex(tok, [18446744073709551615.0], 25) ... OK: got object of type [array]: [ 18446744073709551615.0 ]
json_tokener_parse_ex(tok, [18446744073709551616.0], 25) ... OK: got object of type [array]: [ 18446744073709551616.0 ]
json_tokener_parse_ex(tok, [18446744073709551616.0], 25) ... OK: got object of type [array]: [ 18446744073709551616.0 ]
json_tokener_parse_ex(tok, noodle , 7) ... OK: got correct error: null expected
json_tokener_parse_ex(tok, naodle , 7) ... OK: got correct error: null expected
json_tokener_parse_ex(tok, track , 6) ... OK: got correct error: boolean expected
@@ -250,6 +255,7 @@ json_tokener_parse_ex(tok, "\t" , 4) ... OK: got object of type [string
json_tokener_parse_ex(tok, "\/" , 4) ... OK: got object of type [string]: "\/"
json_tokener_parse_ex(tok, "/" , 3) ... OK: got object of type [string]: "\/"
json_tokener_parse_ex(tok, "\a" , 4) ... OK: got correct error: invalid string sequence
json_tokener_parse_ex(tok, 'foo' , 5) ... OK: got object of type [string]: "foo"
json_tokener_parse_ex(tok, 'foo' , 5) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, [1,2,3] , 7) ... OK: got object of type [array]: [ 1, 2, 3 ]
json_tokener_parse_ex(tok, [1,2,3} , 7) ... OK: got correct error: array value separator ',' expected
@@ -263,8 +269,9 @@ json_tokener_parse_ex(tok, {"a":1 , 6) ... OK: got correct error: continu
json_tokener_parse_ex(tok, [,] , 3) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, [,1] , 4) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, [1,2,3,] , 8) ... OK: got object of type [array]: [ 1, 2, 3 ]
json_tokener_parse_ex(tok, [1,2,,3,] , 9) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, [1,2,3,] , 8) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, [1,2,,3,] , 9) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, [1,2,,3,] , 9) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, {"a":1,} , 8) ... OK: got correct error: unexpected character
json_tokener_parse_ex(tok, "123asc$%&" , 11) ... OK: got object of type [string]: "123asc$%&"
json_tokener_parse_ex(tok, "123asc$%&" , 11) ... OK: got object of type [string]: "123asc$%&"
@@ -322,5 +329,5 @@ json_tokener_parse_ex(tok, "" , 3) ... OK: got correct error: invalid
json_tokener_parse_ex(tok, "" , 3) ... OK: got correct error: invalid string sequence
json_tokener_parse_ex(tok, "" , 3) ... OK: got correct error: invalid string sequence
json_tokener_parse_ex(tok, "" , 3) ... OK: got correct error: invalid string sequence
json_tokener_parse_ex(tok, "" , 3) ... OK: got correct error: invalid string sequence
json_tokener_parse_ex(tok, "" , 3) ... OK: got correct error: invalid string sequence
json_tokener_parse_ex(tok, "" , 3) ... OK: got correct error: invalid string sequence