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In PQsendQueryStart(), avoid leaking any left-over async result.

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Ordinarily there would not be an async result sitting around at this
point, but it appears that in corner cases there can be.  Considering
all the work we're about to launch, it's hardly going to cost anything
noticeable to check.

It's been like this forever, so back-patch to all supported branches.

Report: <CAD-Qf1eLUtBOTPXyFQGW-4eEsop31tVVdZPu4kL9pbQ6tJPO8g@mail.gmail.com>
This commit is contained in:
Tom Lane 2016-10-10 10:35:58 -04:00
parent d1a9f128de
commit 4f87f76409
1 changed files with 1 additions and 2 deletions
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3
src/interfaces/libpq/fe-exec.c
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@ -1384,8 +1384,7 @@ PQsendQueryStart(PGconn *conn)
}
/* initialize async result-accumulation state */
conn->result = NULL;
conn->next_result = NULL;
pqClearAsyncResult(conn);
/* reset single-row processing mode */
conn->singleRowMode = false;