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MDEV-20593 SIGSEGV in report_json_error_ex (on optimized builds).

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When first argument to the JSON_MERGE_PATCH was NULL and second - the
invalid JSON line, the error code was garbage. So it should be set to 0
initially.
This commit is contained in:
Alexey Botchkov
2020-10-22 15:51:14 +04:00
parent 620ea816ad
commit 21ea14db8c
3 changed files with 8 additions and 0 deletions
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5
mysql-test/r/func_json.result
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@ -898,6 +898,11 @@ NULL
SELECT JSON_MERGE_PATCH(NULL, '[1,2,3]');
JSON_MERGE_PATCH(NULL, '[1,2,3]')
[1, 2, 3]
SELECT JSON_MERGE_PATCH(NULL, 'a');
JSON_MERGE_PATCH(NULL, 'a')
NULL
Warnings:
Warning 4038 Syntax error in JSON text in argument 2 to function 'json_merge_patch' at position 1
SELECT JSON_MERGE_PATCH('{"a":"b"}', NULL, '[1,2,3]', '{"c":null,"d":"e"}');
JSON_MERGE_PATCH('{"a":"b"}', NULL, '[1,2,3]', '{"c":null,"d":"e"}')
{"d": "e"}

1
mysql-test/t/func_json.test
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@ -531,6 +531,7 @@ DROP TABLE merge_t;
SELECT JSON_MERGE_PATCH('{"a":"b"}', NULL, '{"c":"d"}');
SELECT JSON_MERGE_PATCH(NULL, '[1,2,3]');
SELECT JSON_MERGE_PATCH(NULL, 'a');
SELECT JSON_MERGE_PATCH('{"a":"b"}', NULL, '[1,2,3]', '{"c":null,"d":"e"}');
--error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

2
sql/item_jsonfunc.cc
View File

@ -2429,6 +2429,8 @@ String *Item_func_json_merge_patch::val_str(String *str)
uint n_arg;
bool empty_result, merge_to_null;
/* To report errors properly if some JSON is invalid. */
je1.s.error= je2.s.error= 0;
merge_to_null= args[0]->null_value;
for (n_arg=1; n_arg < arg_count; n_arg++)