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Fix overly tense optimization of PLpgSQL_func_hashkey: we must represent

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the isTrigger state explicitly, not rely on nonzero-ness of trigrelOid
to indicate trigger-hood, because trigrelOid will be left zero when compiling
for validation.  The (useless) function hash entry built by the validator
was able to match an ordinary non-trigger call later in the same session,
thereby bypassing the check that is supposed to prevent such a call.
Per report from Alvaro.

It might be worth suppressing the useless hash entry altogether, but
that's a bigger change than I want to consider back-patching.

Back-patch to 8.0.  7.4 doesn't have the problem because it doesn't
have validation mode.
This commit is contained in:
Tom Lane 2008-10-09 16:35:33 +00:00
parent cb0a4fed98
commit 603ce02654
2 changed files with 10 additions and 3 deletions
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7
src/pl/plpgsql/src/pl_comp.c
View File

@ -3,7 +3,7 @@
* procedural language
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_comp.c,v 1.83.4.1 2007/02/08 18:38:03 tgl Exp $
* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_comp.c,v 1.83.4.2 2008/10/09 16:35:33 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@ -1880,12 +1880,15 @@ compute_function_hashkey(FunctionCallInfo fcinfo,
/* get function OID */
hashkey->funcOid = fcinfo->flinfo->fn_oid;
/* get call context */
hashkey->isTrigger = CALLED_AS_TRIGGER(fcinfo);
/*
* if trigger, get relation OID. In validation mode we do not know
* what relation is intended to be used, so we leave trigrelOid zero;
* the hash entry built in this case will never really be used.
*/
if (CALLED_AS_TRIGGER(fcinfo) && !forValidator)
if (hashkey->isTrigger && !forValidator)
{
TriggerData *trigdata = (TriggerData *) fcinfo->context;

6
src/pl/plpgsql/src/plpgsql.h
View File

@ -3,7 +3,7 @@
* procedural language
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/pl/plpgsql/src/plpgsql.h,v 1.56 2004/09/16 16:58:44 tgl Exp $
* $PostgreSQL: pgsql/src/pl/plpgsql/src/plpgsql.h,v 1.56.4.1 2008/10/09 16:35:33 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@ -552,6 +552,10 @@ typedef struct PLpgSQL_func_hashkey
{ /* Hash lookup key for functions */
Oid funcOid;
bool isTrigger; /* true if called as a trigger */
/* be careful that pad bytes in this struct get zeroed! */
/*
* For a trigger function, the OID of the relation triggered on is
* part of the hashkey --- we want to compile the trigger separately