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Code Issues

Additional patch for CORE-6015 : Segfault when using expression index with complex expression.

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Changed way to detect indirect recursion: when req_caller chain is broken by EXECUTE STATEMENT.
This commit is contained in:
hvlad 2021-04-19 14:41:41 +03:00
parent e2662ffee6
commit dc9e02697d
3 changed files with 9 additions and 8 deletions
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5
src/jrd/JrdStatement.cpp
View File

@ -334,7 +334,7 @@ bool JrdStatement::isActive() const
return false;
}
jrd_req* JrdStatement::findRequest(thread_db* tdbb)
jrd_req* JrdStatement::findRequest(thread_db* tdbb, bool unique)
{
SET_TDBB(tdbb);
Attachment* const attachment = tdbb->getAttachment();
@ -363,6 +363,9 @@ jrd_req* JrdStatement::findRequest(thread_db* tdbb)
break;
}
if (unique)
return NULL;
++count;
}
else if (!(next->req_flags & req_in_use) && !clone)

2
src/jrd/JrdStatement.h
View File

@ -51,7 +51,7 @@ public:
const Routine* getRoutine() const;
bool isActive() const;
jrd_req* findRequest(thread_db* tdbb);
jrd_req* findRequest(thread_db* tdbb, bool unique = false);
jrd_req* getRequest(thread_db* tdbb, USHORT level);
void verifyAccess(thread_db* tdbb);
void release(thread_db* tdbb);

10
src/jrd/btr.cpp
View File

@ -547,13 +547,11 @@ DSC* BTR_eval_expression(thread_db* tdbb, index_desc* idx, Record* record, bool&
// check for resursive expression evaluation
jrd_req* const org_request = tdbb->getRequest();
for (auto req = org_request; req; req = req->req_caller)
{
if (req->getStatement() == idx->idx_expression_statement)
ERR_post(Arg::Gds(isc_random) << "Attempt to evaluate index expression recursively");
}
jrd_req* const expr_request = idx->idx_expression_statement->findRequest(tdbb, true);
if (expr_request == NULL)
ERR_post(Arg::Gds(isc_random) << "Attempt to evaluate index expression recursively");
jrd_req* const expr_request = idx->idx_expression_statement->findRequest(tdbb);
fb_assert(expr_request != org_request);
fb_assert(expr_request->req_caller == NULL);