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Fixed buffer underflow in visitParamExtractRaw

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This commit is contained in:
Alexey Milovidov 2019-07-05 21:23:14 +03:00
parent 2469ec1af3
commit 1c2e422797
3 changed files with 3 additions and 1 deletions
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2
dbms/src/Functions/FunctionsVisitParam.h
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@ -100,7 +100,7 @@ struct ExtractRaw
for (auto extract_begin = pos; pos != end; ++pos)
{
if (*pos == current_expect_end)
if (current_expect_end && *pos == current_expect_end)
{
expects_end.pop_back();
current_expect_end = expects_end.empty() ? 0 : expects_end.back();

1
dbms/tests/queries/0_stateless/00961_visit_param_buffer_underflow.reference Normal file
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@ -0,0 +1 @@

1
dbms/tests/queries/0_stateless/00961_visit_param_buffer_underflow.sql Normal file
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@ -0,0 +1 @@
SELECT visitParamExtractRaw('\"a\":', 'a');