Nikolay Shaplov <dhyan@nataraj.su> writes:
> I found a bug in jsonb_in function (it converts json from sting representation
> into jsonb internal representation).
Yeah. Looks like json_lex_string is failing to honor the invariant
that it needs to set token_terminator ... although the documentation
of the function certainly isn't helping. I think we need the attached.
A nice side benefit is that the error context reports get a lot more
useful --- somebody should have inquired before as to why they were
so bogus.
regards, tom lane
diff --git a/src/backend/utils/adt/jsonfuncs.c b/src/backend/utils/adt/jsonfuncs.c
index bdfc48cdf5..7a36f74dad 100644
--- a/src/backend/utils/adt/jsonfuncs.c
+++ b/src/backend/utils/adt/jsonfuncs.c
@@ -675,6 +675,7 @@ report_json_context(JsonLexContext *lex)
line_start = lex->line_start;
context_start = line_start;
context_end = lex->token_terminator;
+ Assert(context_end >= context_start);
/* Advance until we are close enough to context_end */
while (context_end - context_start >= 50)
diff --git a/src/common/jsonapi.c b/src/common/jsonapi.c
index e4ff3f3602..4e2a664603 100644
--- a/src/common/jsonapi.c
+++ b/src/common/jsonapi.c
@@ -697,6 +697,14 @@ json_lex(JsonLexContext *lex)
/*
* The next token in the input stream is known to be a string; lex it.
+ *
+ * If lex->strval isn't NULL, fill it with the decoded string.
+ * Set lex->token_terminator to the end of the decoded input, and in
+ * success cases, transfer its previous value to lex->prev_token_terminator.
+ * Return JSON_SUCCESS or an error code.
+ *
+ * Note: be careful that all error exits advance lex->token_terminator
+ * to the point after the character we detected the error on.
*/
static inline JsonParseErrorType
json_lex_string(JsonLexContext *lex)
@@ -705,6 +713,19 @@ json_lex_string(JsonLexContext *lex)
char *const end = lex->input + lex->input_length;
int hi_surrogate = -1;
+ /* Convenience macros */
+#define FAIL_AT_CHAR_START(code) \
+ do { \
+ lex->token_terminator = s; \
+ return code; \
+ } while (0)
+#define FAIL_AT_CHAR_END(code) \
+ do { \
+ lex->token_terminator = \
+ s + pg_encoding_mblen_bounded(lex->input_encoding, s); \
+ return code; \
+ } while (0)
+
if (lex->strval != NULL)
resetStringInfo(lex->strval);
@@ -715,10 +736,7 @@ json_lex_string(JsonLexContext *lex)
s++;
/* Premature end of the string. */
if (s >= end)
- {
- lex->token_terminator = s;
- return JSON_INVALID_TOKEN;
- }
+ FAIL_AT_CHAR_START(JSON_INVALID_TOKEN);
else if (*s == '"')
break;
else if (*s == '\\')
@@ -726,10 +744,7 @@ json_lex_string(JsonLexContext *lex)
/* OK, we have an escape character. */
s++;
if (s >= end)
- {
- lex->token_terminator = s;
- return JSON_INVALID_TOKEN;
- }
+ FAIL_AT_CHAR_START(JSON_INVALID_TOKEN);
else if (*s == 'u')
{
int i;
@@ -739,10 +754,7 @@ json_lex_string(JsonLexContext *lex)
{
s++;
if (s >= end)
- {
- lex->token_terminator = s;
- return JSON_INVALID_TOKEN;
- }
+ FAIL_AT_CHAR_START(JSON_INVALID_TOKEN);
else if (*s >= '0' && *s <= '9')
ch = (ch * 16) + (*s - '0');
else if (*s >= 'a' && *s <= 'f')
@@ -750,10 +762,7 @@ json_lex_string(JsonLexContext *lex)
else if (*s >= 'A' && *s <= 'F')
ch = (ch * 16) + (*s - 'A') + 10;
else
- {
- lex->token_terminator = s + pg_encoding_mblen_bounded(lex->input_encoding, s);
- return JSON_UNICODE_ESCAPE_FORMAT;
- }
+ FAIL_AT_CHAR_END(JSON_UNICODE_ESCAPE_FORMAT);
}
if (lex->strval != NULL)
{
@@ -763,20 +772,20 @@ json_lex_string(JsonLexContext *lex)
if (is_utf16_surrogate_first(ch))
{
if (hi_surrogate != -1)
- return JSON_UNICODE_HIGH_SURROGATE;
+ FAIL_AT_CHAR_END(JSON_UNICODE_HIGH_SURROGATE);
hi_surrogate = ch;
continue;
}
else if (is_utf16_surrogate_second(ch))
{
if (hi_surrogate == -1)
- return JSON_UNICODE_LOW_SURROGATE;
+ FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
ch = surrogate_pair_to_codepoint(hi_surrogate, ch);
hi_surrogate = -1;
}
if (hi_surrogate != -1)
- return JSON_UNICODE_LOW_SURROGATE;
+ FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
/*
* Reject invalid cases. We can't have a value above
@@ -786,7 +795,7 @@ json_lex_string(JsonLexContext *lex)
if (ch == 0)
{
/* We can't allow this, since our TEXT type doesn't */
- return JSON_UNICODE_CODE_POINT_ZERO;
+ FAIL_AT_CHAR_END(JSON_UNICODE_CODE_POINT_ZERO);
}
/*
@@ -800,7 +809,7 @@ json_lex_string(JsonLexContext *lex)
char cbuf[MAX_UNICODE_EQUIVALENT_STRING + 1];
if (!pg_unicode_to_server_noerror(ch, (unsigned char *) cbuf))
- return JSON_UNICODE_UNTRANSLATABLE;
+ FAIL_AT_CHAR_END(JSON_UNICODE_UNTRANSLATABLE);
appendStringInfoString(lex->strval, cbuf);
}
#else
@@ -820,14 +829,14 @@ json_lex_string(JsonLexContext *lex)
appendStringInfoChar(lex->strval, (char) ch);
}
else
- return JSON_UNICODE_HIGH_ESCAPE;
+ FAIL_AT_CHAR_END(JSON_UNICODE_HIGH_ESCAPE);
#endif /* FRONTEND */
}
}
else if (lex->strval != NULL)
{
if (hi_surrogate != -1)
- return JSON_UNICODE_LOW_SURROGATE;
+ FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
switch (*s)
{
@@ -852,10 +861,14 @@ json_lex_string(JsonLexContext *lex)
appendStringInfoChar(lex->strval, '\t');
break;
default:
- /* Not a valid string escape, so signal error. */
+
+ /*
+ * Not a valid string escape, so signal error. We
+ * adjust token_start so that just the escape sequence
+ * is reported, not the whole string.
+ */
lex->token_start = s;
- lex->token_terminator = s + pg_encoding_mblen_bounded(lex->input_encoding, s);
- return JSON_ESCAPING_INVALID;
+ FAIL_AT_CHAR_END(JSON_ESCAPING_INVALID);
}
}
else if (strchr("\"\\/bfnrt", *s) == NULL)
@@ -868,8 +881,7 @@ json_lex_string(JsonLexContext *lex)
* shown it's not a performance win.
*/
lex->token_start = s;
- lex->token_terminator = s + pg_encoding_mblen_bounded(lex->input_encoding, s);
- return JSON_ESCAPING_INVALID;
+ FAIL_AT_CHAR_END(JSON_ESCAPING_INVALID);
}
}
else
@@ -877,7 +889,7 @@ json_lex_string(JsonLexContext *lex)
char *p = s;
if (hi_surrogate != -1)
- return JSON_UNICODE_LOW_SURROGATE;
+ FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
/*
* Skip to the first byte that requires special handling, so we
@@ -917,12 +929,18 @@ json_lex_string(JsonLexContext *lex)
}
if (hi_surrogate != -1)
+ {
+ lex->token_terminator = s + 1;
return JSON_UNICODE_LOW_SURROGATE;
+ }
/* Hooray, we found the end of the string! */
lex->prev_token_terminator = lex->token_terminator;
lex->token_terminator = s + 1;
return JSON_SUCCESS;
+
+#undef FAIL_AT_CHAR_START
+#undef FAIL_AT_CHAR_END
}
/*
diff --git a/src/test/regress/expected/json_encoding.out b/src/test/regress/expected/json_encoding.out
index f18ba9ebb2..fe729db8c9 100644
--- a/src/test/regress/expected/json_encoding.out
+++ b/src/test/regress/expected/json_encoding.out
@@ -56,19 +56,19 @@ select json '{ "a": "\ud83d\ude04\ud83d\udc36" }' -> 'a' as correct_in_utf8;
select json '{ "a": "\ud83d\ud83d" }' -> 'a'; -- 2 high surrogates in a row
ERROR: invalid input syntax for type json
DETAIL: Unicode high surrogate must not follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83d\ud83d...
select json '{ "a": "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
ERROR: invalid input syntax for type json
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ude04...
select json '{ "a": "\ud83dX" }' -> 'a'; -- orphan high surrogate
ERROR: invalid input syntax for type json
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83dX...
select json '{ "a": "\ude04X" }' -> 'a'; -- orphan low surrogate
ERROR: invalid input syntax for type json
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ude04...
--handling of simple unicode escapes
select json '{ "a": "the Copyright \u00a9 sign" }' as correct_in_utf8;
correct_in_utf8
@@ -121,7 +121,7 @@ select json '{ "a": "dollar \\u0024 character" }' ->> 'a' as not_an_escape;
select json '{ "a": "null \u0000 escape" }' ->> 'a' as fails;
ERROR: unsupported Unicode escape sequence
DETAIL: \u0000 cannot be converted to text.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "null \u0000...
select json '{ "a": "null \\u0000 escape" }' ->> 'a' as not_an_escape;
not_an_escape
--------------------
@@ -159,7 +159,7 @@ ERROR: unsupported Unicode escape sequence
LINE 1: SELECT '"\u0000"'::jsonb;
^
DETAIL: \u0000 cannot be converted to text.
-CONTEXT: JSON data, line 1: ...
+CONTEXT: JSON data, line 1: "\u0000...
-- use octet_length here so we don't get an odd unicode char in the
-- output
SELECT octet_length('"\uaBcD"'::jsonb::text); -- OK, uppercase and lower case both OK
@@ -180,25 +180,25 @@ ERROR: invalid input syntax for type json
LINE 1: SELECT jsonb '{ "a": "\ud83d\ud83d" }' -> 'a';
^
DETAIL: Unicode high surrogate must not follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83d\ud83d...
SELECT jsonb '{ "a": "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
ERROR: invalid input syntax for type json
LINE 1: SELECT jsonb '{ "a": "\ude04\ud83d" }' -> 'a';
^
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ude04...
SELECT jsonb '{ "a": "\ud83dX" }' -> 'a'; -- orphan high surrogate
ERROR: invalid input syntax for type json
LINE 1: SELECT jsonb '{ "a": "\ud83dX" }' -> 'a';
^
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83dX...
SELECT jsonb '{ "a": "\ude04X" }' -> 'a'; -- orphan low surrogate
ERROR: invalid input syntax for type json
LINE 1: SELECT jsonb '{ "a": "\ude04X" }' -> 'a';
^
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ude04...
-- handling of simple unicode escapes
SELECT jsonb '{ "a": "the Copyright \u00a9 sign" }' as correct_in_utf8;
correct_in_utf8
@@ -223,7 +223,7 @@ ERROR: unsupported Unicode escape sequence
LINE 1: SELECT jsonb '{ "a": "null \u0000 escape" }' as fails;
^
DETAIL: \u0000 cannot be converted to text.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "null \u0000...
SELECT jsonb '{ "a": "null \\u0000 escape" }' as not_an_escape;
not_an_escape
------------------------------
@@ -253,7 +253,7 @@ ERROR: unsupported Unicode escape sequence
LINE 1: SELECT jsonb '{ "a": "null \u0000 escape" }' ->> 'a' as fai...
^
DETAIL: \u0000 cannot be converted to text.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "null \u0000...
SELECT jsonb '{ "a": "null \\u0000 escape" }' ->> 'a' as not_an_escape;
not_an_escape
--------------------
diff --git a/src/test/regress/expected/json_encoding_1.out b/src/test/regress/expected/json_encoding_1.out
index 77bdaf63a1..5c8d91ad0b 100644
--- a/src/test/regress/expected/json_encoding_1.out
+++ b/src/test/regress/expected/json_encoding_1.out
@@ -50,23 +50,23 @@ SELECT '"\uaBcD"'::json; -- OK, uppercase and lower case both OK
select json '{ "a": "\ud83d\ude04\ud83d\udc36" }' -> 'a' as correct_in_utf8;
ERROR: unsupported Unicode escape sequence
DETAIL: Unicode escape value could not be translated to the server's encoding SQL_ASCII.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83d\ude04...
select json '{ "a": "\ud83d\ud83d" }' -> 'a'; -- 2 high surrogates in a row
ERROR: invalid input syntax for type json
DETAIL: Unicode high surrogate must not follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83d\ud83d...
select json '{ "a": "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
ERROR: invalid input syntax for type json
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ude04...
select json '{ "a": "\ud83dX" }' -> 'a'; -- orphan high surrogate
ERROR: invalid input syntax for type json
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83dX...
select json '{ "a": "\ude04X" }' -> 'a'; -- orphan low surrogate
ERROR: invalid input syntax for type json
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ude04...
--handling of simple unicode escapes
select json '{ "a": "the Copyright \u00a9 sign" }' as correct_in_utf8;
correct_in_utf8
@@ -101,7 +101,7 @@ select json '{ "a": "null \\u0000 escape" }' as not_an_escape;
select json '{ "a": "the Copyright \u00a9 sign" }' ->> 'a' as correct_in_utf8;
ERROR: unsupported Unicode escape sequence
DETAIL: Unicode escape value could not be translated to the server's encoding SQL_ASCII.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "the Copyright \u00a9...
select json '{ "a": "dollar \u0024 character" }' ->> 'a' as correct_everywhere;
correct_everywhere
--------------------
@@ -117,7 +117,7 @@ select json '{ "a": "dollar \\u0024 character" }' ->> 'a' as not_an_escape;
select json '{ "a": "null \u0000 escape" }' ->> 'a' as fails;
ERROR: unsupported Unicode escape sequence
DETAIL: \u0000 cannot be converted to text.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "null \u0000...
select json '{ "a": "null \\u0000 escape" }' ->> 'a' as not_an_escape;
not_an_escape
--------------------
@@ -155,7 +155,7 @@ ERROR: unsupported Unicode escape sequence
LINE 1: SELECT '"\u0000"'::jsonb;
^
DETAIL: \u0000 cannot be converted to text.
-CONTEXT: JSON data, line 1: ...
+CONTEXT: JSON data, line 1: "\u0000...
-- use octet_length here so we don't get an odd unicode char in the
-- output
SELECT octet_length('"\uaBcD"'::jsonb::text); -- OK, uppercase and lower case both OK
@@ -163,45 +163,45 @@ ERROR: unsupported Unicode escape sequence
LINE 1: SELECT octet_length('"\uaBcD"'::jsonb::text);
^
DETAIL: Unicode escape value could not be translated to the server's encoding SQL_ASCII.
-CONTEXT: JSON data, line 1: ...
+CONTEXT: JSON data, line 1: "\uaBcD...
-- handling of unicode surrogate pairs
SELECT octet_length((jsonb '{ "a": "\ud83d\ude04\ud83d\udc36" }' -> 'a')::text) AS correct_in_utf8;
ERROR: unsupported Unicode escape sequence
LINE 1: SELECT octet_length((jsonb '{ "a": "\ud83d\ude04\ud83d\udc3...
^
DETAIL: Unicode escape value could not be translated to the server's encoding SQL_ASCII.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83d\ude04...
SELECT jsonb '{ "a": "\ud83d\ud83d" }' -> 'a'; -- 2 high surrogates in a row
ERROR: invalid input syntax for type json
LINE 1: SELECT jsonb '{ "a": "\ud83d\ud83d" }' -> 'a';
^
DETAIL: Unicode high surrogate must not follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83d\ud83d...
SELECT jsonb '{ "a": "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
ERROR: invalid input syntax for type json
LINE 1: SELECT jsonb '{ "a": "\ude04\ud83d" }' -> 'a';
^
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ude04...
SELECT jsonb '{ "a": "\ud83dX" }' -> 'a'; -- orphan high surrogate
ERROR: invalid input syntax for type json
LINE 1: SELECT jsonb '{ "a": "\ud83dX" }' -> 'a';
^
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ud83dX...
SELECT jsonb '{ "a": "\ude04X" }' -> 'a'; -- orphan low surrogate
ERROR: invalid input syntax for type json
LINE 1: SELECT jsonb '{ "a": "\ude04X" }' -> 'a';
^
DETAIL: Unicode low surrogate must follow a high surrogate.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "\ude04...
-- handling of simple unicode escapes
SELECT jsonb '{ "a": "the Copyright \u00a9 sign" }' as correct_in_utf8;
ERROR: unsupported Unicode escape sequence
LINE 1: SELECT jsonb '{ "a": "the Copyright \u00a9 sign" }' as corr...
^
DETAIL: Unicode escape value could not be translated to the server's encoding SQL_ASCII.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "the Copyright \u00a9...
SELECT jsonb '{ "a": "dollar \u0024 character" }' as correct_everywhere;
correct_everywhere
-----------------------------
@@ -219,7 +219,7 @@ ERROR: unsupported Unicode escape sequence
LINE 1: SELECT jsonb '{ "a": "null \u0000 escape" }' as fails;
^
DETAIL: \u0000 cannot be converted to text.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "null \u0000...
SELECT jsonb '{ "a": "null \\u0000 escape" }' as not_an_escape;
not_an_escape
------------------------------
@@ -231,7 +231,7 @@ ERROR: unsupported Unicode escape sequence
LINE 1: SELECT jsonb '{ "a": "the Copyright \u00a9 sign" }' ->> 'a'...
^
DETAIL: Unicode escape value could not be translated to the server's encoding SQL_ASCII.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "the Copyright \u00a9...
SELECT jsonb '{ "a": "dollar \u0024 character" }' ->> 'a' as correct_everywhere;
correct_everywhere
--------------------
@@ -249,7 +249,7 @@ ERROR: unsupported Unicode escape sequence
LINE 1: SELECT jsonb '{ "a": "null \u0000 escape" }' ->> 'a' as fai...
^
DETAIL: \u0000 cannot be converted to text.
-CONTEXT: JSON data, line 1: { "a":...
+CONTEXT: JSON data, line 1: { "a": "null \u0000...
SELECT jsonb '{ "a": "null \\u0000 escape" }' ->> 'a' as not_an_escape;
not_an_escape
--------------------
