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Commit52e9a78

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Fix JSON error reporting for many cases of erroneous string values.
The majority of error exit cases in json_lex_string() failed toset lex->token_terminator, causing problems for the error contextreporting code: it would see token_terminator less than token_startand do something more or less nuts. In v14 and up the end resultcould be as bad as a crash in report_json_context(). Olderversions accidentally avoided that fate; but all versions produceerror context lines that are far less useful than intended,because they'd stop at the end of the prior token instead ofcontinuing to where the actually-bad input is.To fix, invent some macros that make it less notationally painfulto do the right thing. Also add documentation about what thefunction is actually required to do; and in >= v14, add an assertionin report_json_context about token_terminator being sufficientlyfar advanced.Per report from Nikolay Shaplov. Back-patch to all supportedversions.Discussion:https://postgr.es/m/7332649.x5DLKWyVIX@thinkpad-pgpro
1 parentbc0bcce commit52e9a78

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3 files changed

+71
-54
lines changed

3 files changed

+71
-54
lines changed

‎src/common/jsonapi.c

Lines changed: 47 additions & 30 deletions
Original file line numberDiff line numberDiff line change
@@ -673,6 +673,14 @@ json_lex(JsonLexContext *lex)
673673

674674
/*
675675
* The next token in the input stream is known to be a string; lex it.
676+
*
677+
* If lex->strval isn't NULL, fill it with the decoded string.
678+
* Set lex->token_terminator to the end of the decoded input, and in
679+
* success cases, transfer its previous value to lex->prev_token_terminator.
680+
* Return JSON_SUCCESS or an error code.
681+
*
682+
* Note: be careful that all error exits advance lex->token_terminator
683+
* to the point after the character we detected the error on.
676684
*/
677685
staticinlineJsonParseErrorType
678686
json_lex_string(JsonLexContext*lex)
@@ -681,6 +689,19 @@ json_lex_string(JsonLexContext *lex)
681689
intlen;
682690
inthi_surrogate=-1;
683691

692+
/* Convenience macros for error exits */
693+
#defineFAIL_AT_CHAR_START(code) \
694+
do { \
695+
lex->token_terminator = s; \
696+
return code; \
697+
} while (0)
698+
#defineFAIL_AT_CHAR_END(code) \
699+
do { \
700+
lex->token_terminator = \
701+
s + pg_encoding_mblen_bounded(lex->input_encoding, s); \
702+
return code; \
703+
} while (0)
704+
684705
if (lex->strval!=NULL)
685706
resetStringInfo(lex->strval);
686707

@@ -693,29 +714,22 @@ json_lex_string(JsonLexContext *lex)
693714
len++;
694715
/* Premature end of the string. */
695716
if (len >=lex->input_length)
696-
{
697-
lex->token_terminator=s;
698-
returnJSON_INVALID_TOKEN;
699-
}
717+
FAIL_AT_CHAR_START(JSON_INVALID_TOKEN);
700718
elseif (*s=='"')
701719
break;
702720
elseif ((unsignedchar)*s<32)
703721
{
704722
/* Per RFC4627, these characters MUST be escaped. */
705723
/* Since *s isn't printable, exclude it from the context string */
706-
lex->token_terminator=s;
707-
returnJSON_ESCAPING_REQUIRED;
724+
FAIL_AT_CHAR_START(JSON_ESCAPING_REQUIRED);
708725
}
709726
elseif (*s=='\\')
710727
{
711728
/* OK, we have an escape character. */
712729
s++;
713730
len++;
714731
if (len >=lex->input_length)
715-
{
716-
lex->token_terminator=s;
717-
returnJSON_INVALID_TOKEN;
718-
}
732+
FAIL_AT_CHAR_START(JSON_INVALID_TOKEN);
719733
elseif (*s=='u')
720734
{
721735
inti;
@@ -726,21 +740,15 @@ json_lex_string(JsonLexContext *lex)
726740
s++;
727741
len++;
728742
if (len >=lex->input_length)
729-
{
730-
lex->token_terminator=s;
731-
returnJSON_INVALID_TOKEN;
732-
}
743+
FAIL_AT_CHAR_START(JSON_INVALID_TOKEN);
733744
elseif (*s >='0'&&*s <='9')
734745
ch= (ch*16)+ (*s-'0');
735746
elseif (*s >='a'&&*s <='f')
736747
ch= (ch*16)+ (*s-'a')+10;
737748
elseif (*s >='A'&&*s <='F')
738749
ch= (ch*16)+ (*s-'A')+10;
739750
else
740-
{
741-
lex->token_terminator=s+pg_encoding_mblen_bounded(lex->input_encoding,s);
742-
returnJSON_UNICODE_ESCAPE_FORMAT;
743-
}
751+
FAIL_AT_CHAR_END(JSON_UNICODE_ESCAPE_FORMAT);
744752
}
745753
if (lex->strval!=NULL)
746754
{
@@ -750,20 +758,20 @@ json_lex_string(JsonLexContext *lex)
750758
if (is_utf16_surrogate_first(ch))
751759
{
752760
if (hi_surrogate!=-1)
753-
returnJSON_UNICODE_HIGH_SURROGATE;
761+
FAIL_AT_CHAR_END(JSON_UNICODE_HIGH_SURROGATE);
754762
hi_surrogate=ch;
755763
continue;
756764
}
757765
elseif (is_utf16_surrogate_second(ch))
758766
{
759767
if (hi_surrogate==-1)
760-
returnJSON_UNICODE_LOW_SURROGATE;
768+
FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
761769
ch=surrogate_pair_to_codepoint(hi_surrogate,ch);
762770
hi_surrogate=-1;
763771
}
764772

765773
if (hi_surrogate!=-1)
766-
returnJSON_UNICODE_LOW_SURROGATE;
774+
FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
767775

768776
/*
769777
* Reject invalid cases. We can't have a value above
@@ -773,7 +781,7 @@ json_lex_string(JsonLexContext *lex)
773781
if (ch==0)
774782
{
775783
/* We can't allow this, since our TEXT type doesn't */
776-
returnJSON_UNICODE_CODE_POINT_ZERO;
784+
FAIL_AT_CHAR_END(JSON_UNICODE_CODE_POINT_ZERO);
777785
}
778786

779787
/*
@@ -810,14 +818,14 @@ json_lex_string(JsonLexContext *lex)
810818
appendStringInfoChar(lex->strval, (char)ch);
811819
}
812820
else
813-
returnJSON_UNICODE_HIGH_ESCAPE;
821+
FAIL_AT_CHAR_END(JSON_UNICODE_HIGH_ESCAPE);
814822
#endif/* FRONTEND */
815823
}
816824
}
817825
elseif (lex->strval!=NULL)
818826
{
819827
if (hi_surrogate!=-1)
820-
returnJSON_UNICODE_LOW_SURROGATE;
828+
FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
821829

822830
switch (*s)
823831
{
@@ -842,10 +850,14 @@ json_lex_string(JsonLexContext *lex)
842850
appendStringInfoChar(lex->strval,'\t');
843851
break;
844852
default:
845-
/* Not a valid string escape, so signal error. */
853+
854+
/*
855+
* Not a valid string escape, so signal error. We
856+
* adjust token_start so that just the escape sequence
857+
* is reported, not the whole string.
858+
*/
846859
lex->token_start=s;
847-
lex->token_terminator=s+pg_encoding_mblen_bounded(lex->input_encoding,s);
848-
returnJSON_ESCAPING_INVALID;
860+
FAIL_AT_CHAR_END(JSON_ESCAPING_INVALID);
849861
}
850862
}
851863
elseif (strchr("\"\\/bfnrt",*s)==NULL)
@@ -858,28 +870,33 @@ json_lex_string(JsonLexContext *lex)
858870
* shown it's not a performance win.
859871
*/
860872
lex->token_start=s;
861-
lex->token_terminator=s+pg_encoding_mblen_bounded(lex->input_encoding,s);
862-
returnJSON_ESCAPING_INVALID;
873+
FAIL_AT_CHAR_END(JSON_ESCAPING_INVALID);
863874
}
864875

865876
}
866877
elseif (lex->strval!=NULL)
867878
{
868879
if (hi_surrogate!=-1)
869-
returnJSON_UNICODE_LOW_SURROGATE;
880+
FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
870881

871882
appendStringInfoChar(lex->strval,*s);
872883
}
873884

874885
}
875886

876887
if (hi_surrogate!=-1)
888+
{
889+
lex->token_terminator=s+1;
877890
returnJSON_UNICODE_LOW_SURROGATE;
891+
}
878892

879893
/* Hooray, we found the end of the string! */
880894
lex->prev_token_terminator=lex->token_terminator;
881895
lex->token_terminator=s+1;
882896
returnJSON_SUCCESS;
897+
898+
#undef FAIL_AT_CHAR_START
899+
#undef FAIL_AT_CHAR_END
883900
}
884901

885902
/*

‎src/test/regress/expected/json_encoding.out

Lines changed: 12 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -56,19 +56,19 @@ select json '{ "a": "\ud83d\ude04\ud83d\udc36" }' -> 'a' as correct_in_utf8;
5656
select json '{ "a": "\ud83d\ud83d" }' -> 'a'; -- 2 high surrogates in a row
5757
ERROR: invalid input syntax for type json
5858
DETAIL: Unicode high surrogate must not follow a high surrogate.
59-
CONTEXT: JSON data, line 1: { "a":...
59+
CONTEXT: JSON data, line 1: { "a": "\ud83d\ud83d...
6060
select json '{ "a": "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
6161
ERROR: invalid input syntax for type json
6262
DETAIL: Unicode low surrogate must follow a high surrogate.
63-
CONTEXT: JSON data, line 1: { "a":...
63+
CONTEXT: JSON data, line 1: { "a": "\ude04...
6464
select json '{ "a": "\ud83dX" }' -> 'a'; -- orphan high surrogate
6565
ERROR: invalid input syntax for type json
6666
DETAIL: Unicode low surrogate must follow a high surrogate.
67-
CONTEXT: JSON data, line 1: { "a":...
67+
CONTEXT: JSON data, line 1: { "a": "\ud83dX...
6868
select json '{ "a": "\ude04X" }' -> 'a'; -- orphan low surrogate
6969
ERROR: invalid input syntax for type json
7070
DETAIL: Unicode low surrogate must follow a high surrogate.
71-
CONTEXT: JSON data, line 1: { "a":...
71+
CONTEXT: JSON data, line 1: { "a": "\ude04...
7272
--handling of simple unicode escapes
7373
select json '{ "a": "the Copyright \u00a9 sign" }' as correct_in_utf8;
7474
correct_in_utf8
@@ -121,7 +121,7 @@ select json '{ "a": "dollar \\u0024 character" }' ->> 'a' as not_an_escape;
121121
select json '{ "a": "null \u0000 escape" }' ->> 'a' as fails;
122122
ERROR: unsupported Unicode escape sequence
123123
DETAIL: \u0000 cannot be converted to text.
124-
CONTEXT: JSON data, line 1: { "a":...
124+
CONTEXT: JSON data, line 1: { "a": "null \u0000...
125125
select json '{ "a": "null \\u0000 escape" }' ->> 'a' as not_an_escape;
126126
not_an_escape
127127
--------------------
@@ -159,7 +159,7 @@ ERROR: unsupported Unicode escape sequence
159159
LINE 1: SELECT '"\u0000"'::jsonb;
160160
^
161161
DETAIL: \u0000 cannot be converted to text.
162-
CONTEXT: JSON data, line 1: ...
162+
CONTEXT: JSON data, line 1:"\u0000...
163163
-- use octet_length here so we don't get an odd unicode char in the
164164
-- output
165165
SELECT octet_length('"\uaBcD"'::jsonb::text); -- OK, uppercase and lower case both OK
@@ -180,25 +180,25 @@ ERROR: invalid input syntax for type json
180180
LINE 1: SELECT jsonb '{ "a": "\ud83d\ud83d" }' -> 'a';
181181
^
182182
DETAIL: Unicode high surrogate must not follow a high surrogate.
183-
CONTEXT: JSON data, line 1: { "a":...
183+
CONTEXT: JSON data, line 1: { "a": "\ud83d\ud83d...
184184
SELECT jsonb '{ "a": "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
185185
ERROR: invalid input syntax for type json
186186
LINE 1: SELECT jsonb '{ "a": "\ude04\ud83d" }' -> 'a';
187187
^
188188
DETAIL: Unicode low surrogate must follow a high surrogate.
189-
CONTEXT: JSON data, line 1: { "a":...
189+
CONTEXT: JSON data, line 1: { "a": "\ude04...
190190
SELECT jsonb '{ "a": "\ud83dX" }' -> 'a'; -- orphan high surrogate
191191
ERROR: invalid input syntax for type json
192192
LINE 1: SELECT jsonb '{ "a": "\ud83dX" }' -> 'a';
193193
^
194194
DETAIL: Unicode low surrogate must follow a high surrogate.
195-
CONTEXT: JSON data, line 1: { "a":...
195+
CONTEXT: JSON data, line 1: { "a": "\ud83dX...
196196
SELECT jsonb '{ "a": "\ude04X" }' -> 'a'; -- orphan low surrogate
197197
ERROR: invalid input syntax for type json
198198
LINE 1: SELECT jsonb '{ "a": "\ude04X" }' -> 'a';
199199
^
200200
DETAIL: Unicode low surrogate must follow a high surrogate.
201-
CONTEXT: JSON data, line 1: { "a":...
201+
CONTEXT: JSON data, line 1: { "a": "\ude04...
202202
-- handling of simple unicode escapes
203203
SELECT jsonb '{ "a": "the Copyright \u00a9 sign" }' as correct_in_utf8;
204204
correct_in_utf8
@@ -223,7 +223,7 @@ ERROR: unsupported Unicode escape sequence
223223
LINE 1: SELECT jsonb '{ "a": "null \u0000 escape" }' as fails;
224224
^
225225
DETAIL: \u0000 cannot be converted to text.
226-
CONTEXT: JSON data, line 1: { "a":...
226+
CONTEXT: JSON data, line 1: { "a": "null \u0000...
227227
SELECT jsonb '{ "a": "null \\u0000 escape" }' as not_an_escape;
228228
not_an_escape
229229
------------------------------
@@ -253,7 +253,7 @@ ERROR: unsupported Unicode escape sequence
253253
LINE 1: SELECT jsonb '{ "a": "null \u0000 escape" }' ->> 'a' as fai...
254254
^
255255
DETAIL: \u0000 cannot be converted to text.
256-
CONTEXT: JSON data, line 1: { "a":...
256+
CONTEXT: JSON data, line 1: { "a": "null \u0000...
257257
SELECT jsonb '{ "a": "null \\u0000 escape" }' ->> 'a' as not_an_escape;
258258
not_an_escape
259259
--------------------

‎src/test/regress/expected/json_encoding_1.out

Lines changed: 12 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -52,19 +52,19 @@ ERROR: conversion between UTF8 and SQL_ASCII is not supported
5252
select json '{ "a": "\ud83d\ud83d" }' -> 'a'; -- 2 high surrogates in a row
5353
ERROR: invalid input syntax for type json
5454
DETAIL: Unicode high surrogate must not follow a high surrogate.
55-
CONTEXT: JSON data, line 1: { "a":...
55+
CONTEXT: JSON data, line 1: { "a": "\ud83d\ud83d...
5656
select json '{ "a": "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
5757
ERROR: invalid input syntax for type json
5858
DETAIL: Unicode low surrogate must follow a high surrogate.
59-
CONTEXT: JSON data, line 1: { "a":...
59+
CONTEXT: JSON data, line 1: { "a": "\ude04...
6060
select json '{ "a": "\ud83dX" }' -> 'a'; -- orphan high surrogate
6161
ERROR: invalid input syntax for type json
6262
DETAIL: Unicode low surrogate must follow a high surrogate.
63-
CONTEXT: JSON data, line 1: { "a":...
63+
CONTEXT: JSON data, line 1: { "a": "\ud83dX...
6464
select json '{ "a": "\ude04X" }' -> 'a'; -- orphan low surrogate
6565
ERROR: invalid input syntax for type json
6666
DETAIL: Unicode low surrogate must follow a high surrogate.
67-
CONTEXT: JSON data, line 1: { "a":...
67+
CONTEXT: JSON data, line 1: { "a": "\ude04...
6868
--handling of simple unicode escapes
6969
select json '{ "a": "the Copyright \u00a9 sign" }' as correct_in_utf8;
7070
correct_in_utf8
@@ -113,7 +113,7 @@ select json '{ "a": "dollar \\u0024 character" }' ->> 'a' as not_an_escape;
113113
select json '{ "a": "null \u0000 escape" }' ->> 'a' as fails;
114114
ERROR: unsupported Unicode escape sequence
115115
DETAIL: \u0000 cannot be converted to text.
116-
CONTEXT: JSON data, line 1: { "a":...
116+
CONTEXT: JSON data, line 1: { "a": "null \u0000...
117117
select json '{ "a": "null \\u0000 escape" }' ->> 'a' as not_an_escape;
118118
not_an_escape
119119
--------------------
@@ -151,7 +151,7 @@ ERROR: unsupported Unicode escape sequence
151151
LINE 1: SELECT '"\u0000"'::jsonb;
152152
^
153153
DETAIL: \u0000 cannot be converted to text.
154-
CONTEXT: JSON data, line 1: ...
154+
CONTEXT: JSON data, line 1:"\u0000...
155155
-- use octet_length here so we don't get an odd unicode char in the
156156
-- output
157157
SELECT octet_length('"\uaBcD"'::jsonb::text); -- OK, uppercase and lower case both OK
@@ -168,25 +168,25 @@ ERROR: invalid input syntax for type json
168168
LINE 1: SELECT jsonb '{ "a": "\ud83d\ud83d" }' -> 'a';
169169
^
170170
DETAIL: Unicode high surrogate must not follow a high surrogate.
171-
CONTEXT: JSON data, line 1: { "a":...
171+
CONTEXT: JSON data, line 1: { "a": "\ud83d\ud83d...
172172
SELECT jsonb '{ "a": "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
173173
ERROR: invalid input syntax for type json
174174
LINE 1: SELECT jsonb '{ "a": "\ude04\ud83d" }' -> 'a';
175175
^
176176
DETAIL: Unicode low surrogate must follow a high surrogate.
177-
CONTEXT: JSON data, line 1: { "a":...
177+
CONTEXT: JSON data, line 1: { "a": "\ude04...
178178
SELECT jsonb '{ "a": "\ud83dX" }' -> 'a'; -- orphan high surrogate
179179
ERROR: invalid input syntax for type json
180180
LINE 1: SELECT jsonb '{ "a": "\ud83dX" }' -> 'a';
181181
^
182182
DETAIL: Unicode low surrogate must follow a high surrogate.
183-
CONTEXT: JSON data, line 1: { "a":...
183+
CONTEXT: JSON data, line 1: { "a": "\ud83dX...
184184
SELECT jsonb '{ "a": "\ude04X" }' -> 'a'; -- orphan low surrogate
185185
ERROR: invalid input syntax for type json
186186
LINE 1: SELECT jsonb '{ "a": "\ude04X" }' -> 'a';
187187
^
188188
DETAIL: Unicode low surrogate must follow a high surrogate.
189-
CONTEXT: JSON data, line 1: { "a":...
189+
CONTEXT: JSON data, line 1: { "a": "\ude04...
190190
-- handling of simple unicode escapes
191191
SELECT jsonb '{ "a": "the Copyright \u00a9 sign" }' as correct_in_utf8;
192192
ERROR: conversion between UTF8 and SQL_ASCII is not supported
@@ -209,7 +209,7 @@ ERROR: unsupported Unicode escape sequence
209209
LINE 1: SELECT jsonb '{ "a": "null \u0000 escape" }' as fails;
210210
^
211211
DETAIL: \u0000 cannot be converted to text.
212-
CONTEXT: JSON data, line 1: { "a":...
212+
CONTEXT: JSON data, line 1: { "a": "null \u0000...
213213
SELECT jsonb '{ "a": "null \\u0000 escape" }' as not_an_escape;
214214
not_an_escape
215215
------------------------------
@@ -237,7 +237,7 @@ ERROR: unsupported Unicode escape sequence
237237
LINE 1: SELECT jsonb '{ "a": "null \u0000 escape" }' ->> 'a' as fai...
238238
^
239239
DETAIL: \u0000 cannot be converted to text.
240-
CONTEXT: JSON data, line 1: { "a":...
240+
CONTEXT: JSON data, line 1: { "a": "null \u0000...
241241
SELECT jsonb '{ "a": "null \\u0000 escape" }' ->> 'a' as not_an_escape;
242242
not_an_escape
243243
--------------------

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