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Commit40a9a16

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Free SQLSTATE and SQLERRM no earlier than other PL/pgSQL variables.
"RETURN SQLERRM" prompted plpgsql_exec_function() to read from freedmemory. Back-patch to 9.0 (all supported versions). Little code ranbetween the premature free and the read, so non-assert builds areunlikely to witness user-visible consequences.
1 parent7a501bc commit40a9a16

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3 files changed

+24
-10
lines changed

3 files changed

+24
-10
lines changed

‎src/pl/plpgsql/src/pl_exec.c

Lines changed: 3 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -1125,8 +1125,9 @@ exec_stmt_block(PLpgSQL_execstate *estate, PLpgSQL_stmt_block *block)
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{
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/*
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* Initialize the magic SQLSTATE and SQLERRM variables for
1128-
* the exception block. We needn't do this until we have
1129-
* found a matching exception.
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* the exception block; this also frees values from any
1129+
* prior use of the same exception. We needn't do this
1130+
* until we have found a matching exception.
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*/
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PLpgSQL_var*state_var;
11321133
PLpgSQL_var*errm_var;
@@ -1144,13 +1145,6 @@ exec_stmt_block(PLpgSQL_execstate *estate, PLpgSQL_stmt_block *block)
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rc=exec_stmts(estate,exception->action);
11461147

1147-
free_var(state_var);
1148-
state_var->value= (Datum)0;
1149-
state_var->isnull= true;
1150-
free_var(errm_var);
1151-
errm_var->value= (Datum)0;
1152-
errm_var->isnull= true;
1153-
11541148
/* re-throw error if requested by handler */
11551149
if (rc==PLPGSQL_RC_RERAISE)
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ReThrowError(edata);

‎src/test/regress/expected/plpgsql.out

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2469,9 +2469,21 @@ NOTICE: P0001 user exception
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(1 row)
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2472+
create function excpt_test4() returns text as $$
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begin
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begin perform 1/0;
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exception when others then return sqlerrm; end;
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end; $$ language plpgsql;
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select excpt_test4();
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excpt_test4
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------------------
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division by zero
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(1 row)
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drop function excpt_test1();
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drop function excpt_test2();
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drop function excpt_test3();
2486+
drop function excpt_test4();
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-- parameters of raise stmt can be expressions
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create function raise_exprs() returns void as $$
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declare

‎src/test/regress/sql/plpgsql.sql

Lines changed: 9 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2093,11 +2093,19 @@ begin
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raise notice'% %', sqlstate, sqlerrm;
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end;
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end; $$ language plpgsql;
2096-
20972096
select excpt_test3();
2097+
2098+
createfunctionexcpt_test4() returnstextas $$
2099+
begin
2100+
begin perform1/0;
2101+
exception when others then return sqlerrm; end;
2102+
end; $$ language plpgsql;
2103+
select excpt_test4();
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20982105
dropfunction excpt_test1();
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dropfunction excpt_test2();
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dropfunction excpt_test3();
2108+
dropfunction excpt_test4();
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-- parameters of raise stmt can be expressions
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createfunctionraise_exprs() returns voidas $$

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