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Commit25a7812

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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 parent30dbdbe commit25a7812

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4 files changed

+78
-59
lines changed

4 files changed

+78
-59
lines changed

‎src/backend/utils/adt/jsonfuncs.c

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -675,6 +675,7 @@ report_json_context(JsonLexContext *lex)
675675
line_start=lex->line_start;
676676
context_start=line_start;
677677
context_end=lex->token_terminator;
678+
Assert(context_end >=context_start);
678679

679680
/* Advance until we are close enough to context_end */
680681
while (context_end-context_start >=50)

‎src/common/jsonapi.c

Lines changed: 47 additions & 29 deletions
Original file line numberDiff line numberDiff line change
@@ -697,6 +697,14 @@ json_lex(JsonLexContext *lex)
697697

698698
/*
699699
* The next token in the input stream is known to be a string; lex it.
700+
*
701+
* If lex->strval isn't NULL, fill it with the decoded string.
702+
* Set lex->token_terminator to the end of the decoded input, and in
703+
* success cases, transfer its previous value to lex->prev_token_terminator.
704+
* Return JSON_SUCCESS or an error code.
705+
*
706+
* Note: be careful that all error exits advance lex->token_terminator
707+
* to the point after the character we detected the error on.
700708
*/
701709
staticinlineJsonParseErrorType
702710
json_lex_string(JsonLexContext*lex)
@@ -705,6 +713,19 @@ json_lex_string(JsonLexContext *lex)
705713
char*constend=lex->input+lex->input_length;
706714
inthi_surrogate=-1;
707715

716+
/* Convenience macros for error exits */
717+
#defineFAIL_AT_CHAR_START(code) \
718+
do { \
719+
lex->token_terminator = s; \
720+
return code; \
721+
} while (0)
722+
#defineFAIL_AT_CHAR_END(code) \
723+
do { \
724+
lex->token_terminator = \
725+
s + pg_encoding_mblen_bounded(lex->input_encoding, s); \
726+
return code; \
727+
} while (0)
728+
708729
if (lex->strval!=NULL)
709730
resetStringInfo(lex->strval);
710731

@@ -715,21 +736,15 @@ json_lex_string(JsonLexContext *lex)
715736
s++;
716737
/* Premature end of the string. */
717738
if (s >=end)
718-
{
719-
lex->token_terminator=s;
720-
returnJSON_INVALID_TOKEN;
721-
}
739+
FAIL_AT_CHAR_START(JSON_INVALID_TOKEN);
722740
elseif (*s=='"')
723741
break;
724742
elseif (*s=='\\')
725743
{
726744
/* OK, we have an escape character. */
727745
s++;
728746
if (s >=end)
729-
{
730-
lex->token_terminator=s;
731-
returnJSON_INVALID_TOKEN;
732-
}
747+
FAIL_AT_CHAR_START(JSON_INVALID_TOKEN);
733748
elseif (*s=='u')
734749
{
735750
inti;
@@ -739,21 +754,15 @@ json_lex_string(JsonLexContext *lex)
739754
{
740755
s++;
741756
if (s >=end)
742-
{
743-
lex->token_terminator=s;
744-
returnJSON_INVALID_TOKEN;
745-
}
757+
FAIL_AT_CHAR_START(JSON_INVALID_TOKEN);
746758
elseif (*s >='0'&&*s <='9')
747759
ch= (ch*16)+ (*s-'0');
748760
elseif (*s >='a'&&*s <='f')
749761
ch= (ch*16)+ (*s-'a')+10;
750762
elseif (*s >='A'&&*s <='F')
751763
ch= (ch*16)+ (*s-'A')+10;
752764
else
753-
{
754-
lex->token_terminator=s+pg_encoding_mblen_bounded(lex->input_encoding,s);
755-
returnJSON_UNICODE_ESCAPE_FORMAT;
756-
}
765+
FAIL_AT_CHAR_END(JSON_UNICODE_ESCAPE_FORMAT);
757766
}
758767
if (lex->strval!=NULL)
759768
{
@@ -763,20 +772,20 @@ json_lex_string(JsonLexContext *lex)
763772
if (is_utf16_surrogate_first(ch))
764773
{
765774
if (hi_surrogate!=-1)
766-
returnJSON_UNICODE_HIGH_SURROGATE;
775+
FAIL_AT_CHAR_END(JSON_UNICODE_HIGH_SURROGATE);
767776
hi_surrogate=ch;
768777
continue;
769778
}
770779
elseif (is_utf16_surrogate_second(ch))
771780
{
772781
if (hi_surrogate==-1)
773-
returnJSON_UNICODE_LOW_SURROGATE;
782+
FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
774783
ch=surrogate_pair_to_codepoint(hi_surrogate,ch);
775784
hi_surrogate=-1;
776785
}
777786

778787
if (hi_surrogate!=-1)
779-
returnJSON_UNICODE_LOW_SURROGATE;
788+
FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
780789

781790
/*
782791
* Reject invalid cases. We can't have a value above
@@ -786,7 +795,7 @@ json_lex_string(JsonLexContext *lex)
786795
if (ch==0)
787796
{
788797
/* We can't allow this, since our TEXT type doesn't */
789-
returnJSON_UNICODE_CODE_POINT_ZERO;
798+
FAIL_AT_CHAR_END(JSON_UNICODE_CODE_POINT_ZERO);
790799
}
791800

792801
/*
@@ -800,7 +809,7 @@ json_lex_string(JsonLexContext *lex)
800809
charcbuf[MAX_UNICODE_EQUIVALENT_STRING+1];
801810

802811
if (!pg_unicode_to_server_noerror(ch, (unsignedchar*)cbuf))
803-
returnJSON_UNICODE_UNTRANSLATABLE;
812+
FAIL_AT_CHAR_END(JSON_UNICODE_UNTRANSLATABLE);
804813
appendStringInfoString(lex->strval,cbuf);
805814
}
806815
#else
@@ -820,14 +829,14 @@ json_lex_string(JsonLexContext *lex)
820829
appendStringInfoChar(lex->strval, (char)ch);
821830
}
822831
else
823-
returnJSON_UNICODE_HIGH_ESCAPE;
832+
FAIL_AT_CHAR_END(JSON_UNICODE_HIGH_ESCAPE);
824833
#endif/* FRONTEND */
825834
}
826835
}
827836
elseif (lex->strval!=NULL)
828837
{
829838
if (hi_surrogate!=-1)
830-
returnJSON_UNICODE_LOW_SURROGATE;
839+
FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
831840

832841
switch (*s)
833842
{
@@ -852,10 +861,14 @@ json_lex_string(JsonLexContext *lex)
852861
appendStringInfoChar(lex->strval,'\t');
853862
break;
854863
default:
855-
/* Not a valid string escape, so signal error. */
864+
865+
/*
866+
* Not a valid string escape, so signal error. We
867+
* adjust token_start so that just the escape sequence
868+
* is reported, not the whole string.
869+
*/
856870
lex->token_start=s;
857-
lex->token_terminator=s+pg_encoding_mblen_bounded(lex->input_encoding,s);
858-
returnJSON_ESCAPING_INVALID;
871+
FAIL_AT_CHAR_END(JSON_ESCAPING_INVALID);
859872
}
860873
}
861874
elseif (strchr("\"\\/bfnrt",*s)==NULL)
@@ -868,16 +881,15 @@ json_lex_string(JsonLexContext *lex)
868881
* shown it's not a performance win.
869882
*/
870883
lex->token_start=s;
871-
lex->token_terminator=s+pg_encoding_mblen_bounded(lex->input_encoding,s);
872-
returnJSON_ESCAPING_INVALID;
884+
FAIL_AT_CHAR_END(JSON_ESCAPING_INVALID);
873885
}
874886
}
875887
else
876888
{
877889
char*p=s;
878890

879891
if (hi_surrogate!=-1)
880-
returnJSON_UNICODE_LOW_SURROGATE;
892+
FAIL_AT_CHAR_END(JSON_UNICODE_LOW_SURROGATE);
881893

882894
/*
883895
* Skip to the first byte that requires special handling, so we
@@ -917,12 +929,18 @@ json_lex_string(JsonLexContext *lex)
917929
}
918930

919931
if (hi_surrogate!=-1)
932+
{
933+
lex->token_terminator=s+1;
920934
returnJSON_UNICODE_LOW_SURROGATE;
935+
}
921936

922937
/* Hooray, we found the end of the string! */
923938
lex->prev_token_terminator=lex->token_terminator;
924939
lex->token_terminator=s+1;
925940
returnJSON_SUCCESS;
941+
942+
#undef FAIL_AT_CHAR_START
943+
#undef FAIL_AT_CHAR_END
926944
}
927945

928946
/*

‎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
--------------------

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