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Fix IsValidJsonNumber() to notice trailing non-alphanumeric garbage.

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Commit e09996ff8d was one brick shy of a load: it didn't insist
that the detected JSON number be the whole of the supplied string.
This allowed inputs such as "2016-01-01" to be misdetected as valid JSON
numbers.  Per bug #13906 from Dmitry Ryabov.

In passing, be more wary of zero-length input (I'm not sure this can
happen given current callers, but better safe than sorry), and do some
minor cosmetic cleanup.
This commit is contained in:
Tom Lane 2016-02-03 01:39:08 -05:00
parent 0b55fef393
commit 1f2b195ebf
3 changed files with 38 additions and 24 deletions
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8
contrib/hstore/expected/hstore.out
View File

@ -1466,10 +1466,10 @@ select cast( hstore '"a key" =>1, b => t, c => null, d=> 12345, e => 012345, f=
{"b": "t", "c": null, "d": "12345", "e": "012345", "f": "1.234", "g": "2.345e+4", "a key": "1"}
(1 row)
select hstore_to_json_loose('"a key" =>1, b => t, c => null, d=> 12345, e => 012345, f=> 1.234, g=> 2.345e+4');
hstore_to_json_loose
------------------------------------------------------------------------------------------
{"b": true, "c": null, "d": 12345, "e": "012345", "f": 1.234, "g": 2.345e+4, "a key": 1}
select hstore_to_json_loose('"a key" =>1, b => t, c => null, d=> 12345, e => 012345, f=> 1.234, g=> 2.345e+4, h=> "2016-01-01"');
hstore_to_json_loose
-------------------------------------------------------------------------------------------------------------
{"b": true, "c": null, "d": 12345, "e": "012345", "f": 1.234, "g": 2.345e+4, "h": "2016-01-01", "a key": 1}
(1 row)
create table test_json_agg (f1 text, f2 hstore);

2
contrib/hstore/sql/hstore.sql
View File

@ -334,7 +334,7 @@ select count(*) from testhstore where h = 'pos=>98, line=>371, node=>CBA, indexe
-- json
select hstore_to_json('"a key" =>1, b => t, c => null, d=> 12345, e => 012345, f=> 1.234, g=> 2.345e+4');
select cast( hstore '"a key" =>1, b => t, c => null, d=> 12345, e => 012345, f=> 1.234, g=> 2.345e+4' as json);
select hstore_to_json_loose('"a key" =>1, b => t, c => null, d=> 12345, e => 012345, f=> 1.234, g=> 2.345e+4');
select hstore_to_json_loose('"a key" =>1, b => t, c => null, d=> 12345, e => 012345, f=> 1.234, g=> 2.345e+4, h=> "2016-01-01"');
create table test_json_agg (f1 text, f2 hstore);
insert into test_json_agg values ('rec1','"a key" =>1, b => t, c => null, d=> 12345, e => 012345, f=> 1.234, g=> 2.345e+4'),

52
src/backend/utils/adt/json.c
View File

@ -63,7 +63,8 @@ typedef enum /* type categories for datum_to_json */
static inline void json_lex(JsonLexContext *lex);
static inline void json_lex_string(JsonLexContext *lex);
static inline void json_lex_number(JsonLexContext *lex, char *s, bool *num_err);
static inline void json_lex_number(JsonLexContext *lex, char *s,
bool *num_err, int *total_len);
static inline void parse_scalar(JsonLexContext *lex, JsonSemAction *sem);
static void parse_object_field(JsonLexContext *lex, JsonSemAction *sem);
static void parse_object(JsonLexContext *lex, JsonSemAction *sem);
@ -166,13 +167,20 @@ lex_expect(JsonParseContext ctx, JsonLexContext *lex, JsonTokenType token)
(c) == '_' || \
IS_HIGHBIT_SET(c))
/* utility function to check if a string is a valid JSON number */
extern bool
/*
* Utility function to check if a string is a valid JSON number.
*
* str is of length len, and need not be null-terminated.
*/
bool
IsValidJsonNumber(const char *str, int len)
{
bool numeric_error;
int total_len;
JsonLexContext dummy_lex;
if (len <= 0)
return false;
/*
* json_lex_number expects a leading '-' to have been eaten already.
@ -191,9 +199,9 @@ IsValidJsonNumber(const char *str, int len)
dummy_lex.input_length = len;
}
json_lex_number(&dummy_lex, dummy_lex.input, &numeric_error);
json_lex_number(&dummy_lex, dummy_lex.input, &numeric_error, &total_len);
return !numeric_error;
return (!numeric_error) && (total_len == dummy_lex.input_length);
}
/*
@ -610,7 +618,7 @@ json_lex(JsonLexContext *lex)
break;
case '-':
/* Negative number. */
json_lex_number(lex, s + 1, NULL);
json_lex_number(lex, s + 1, NULL, NULL);
lex->token_type = JSON_TOKEN_NUMBER;
break;
case '0':
@ -624,7 +632,7 @@ json_lex(JsonLexContext *lex)
case '8':
case '9':
/* Positive number. */
json_lex_number(lex, s, NULL);
json_lex_number(lex, s, NULL, NULL);
lex->token_type = JSON_TOKEN_NUMBER;
break;
default:
@ -919,7 +927,7 @@ json_lex_string(JsonLexContext *lex)
lex->token_terminator = s + 1;
}
/*-------------------------------------------------------------------------
/*
* The next token in the input stream is known to be a number; lex it.
*
* In JSON, a number consists of four parts:
@ -940,29 +948,30 @@ json_lex_string(JsonLexContext *lex)
* followed by at least one digit.)
*
* The 's' argument to this function points to the ostensible beginning
* of part 2 - i.e. the character after any optional minus sign, and the
* of part 2 - i.e. the character after any optional minus sign, or the
* first character of the string if there is none.
*
*-------------------------------------------------------------------------
* If num_err is not NULL, we return an error flag to *num_err rather than
* raising an error for a badly-formed number. Also, if total_len is not NULL
* the distance from lex->input to the token end+1 is returned to *total_len.
*/
static inline void
json_lex_number(JsonLexContext *lex, char *s, bool *num_err)
json_lex_number(JsonLexContext *lex, char *s,
bool *num_err, int *total_len)
{
bool error = false;
char *p;
int len;
int len = s - lex->input;
len = s - lex->input;
/* Part (1): leading sign indicator. */
/* Caller already did this for us; so do nothing. */
/* Part (2): parse main digit string. */
if (*s == '0')
if (len < lex->input_length && *s == '0')
{
s++;
len++;
}
else if (*s >= '1' && *s <= '9')
else if (len < lex->input_length && *s >= '1' && *s <= '9')
{
do
{
@ -1017,18 +1026,23 @@ json_lex_number(JsonLexContext *lex, char *s, bool *num_err)
* here should be considered part of the token for error-reporting
* purposes.
*/
for (p = s; len < lex->input_length && JSON_ALPHANUMERIC_CHAR(*p); p++, len++)
for (; len < lex->input_length && JSON_ALPHANUMERIC_CHAR(*s); s++, len++)
error = true;
if (total_len != NULL)
*total_len = len;
if (num_err != NULL)
{
/* let the caller handle the error */
/* let the caller handle any error */
*num_err = error;
}
else
{
/* return token endpoint */
lex->prev_token_terminator = lex->token_terminator;
lex->token_terminator = p;
lex->token_terminator = s;
/* handle error if any */
if (error)
report_invalid_token(lex);
}