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Commitd79f00e

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In transformRowExpr(), check for too many columns in the row.
A RowExpr with more than MaxTupleAttributeNumber columns would fail atexecution anyway, since we cannot form a tuple datum with more than thatmany columns. While heap_form_tuple() has a check for too many columns,it emerges that there are some intermediate bits of code that don'tcheck and can be driven to failure with sufficiently many columns.Checking this at parse time seems like the most appropriate place toinstall a defense, since we already check SELECT list length there.While at it, make the SELECT-list-length error use the same errcode(TOO_MANY_COLUMNS) as heap_form_tuple does, rather than the genericPROGRAM_LIMIT_EXCEEDED.Per bug #17561 from Egor Chindyaskin. The given test case crashesin all supported branches (and probably a lot further back),so patch all.Discussion:https://postgr.es/m/17561-80350151b9ad2ad4@postgresql.org
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‎src/backend/parser/parse_expr.c

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Original file line numberDiff line numberDiff line change
@@ -2267,6 +2267,14 @@ transformRowExpr(ParseState *pstate, RowExpr *r, bool allowDefault)
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newr->args=transformExpressionList(pstate,r->args,
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pstate->p_expr_kind,allowDefault);
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/* Disallow more columns than will fit in a tuple */
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if (list_length(newr->args)>MaxTupleAttributeNumber)
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ereport(ERROR,
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(errcode(ERRCODE_TOO_MANY_COLUMNS),
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errmsg("ROW expressions can have at most %d entries",
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MaxTupleAttributeNumber),
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parser_errposition(pstate,r->location)));
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/* Barring later casting, we consider the type RECORD */
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newr->row_typeid=RECORDOID;
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newr->row_format=COERCE_IMPLICIT_CAST;

‎src/backend/parser/parse_node.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -83,7 +83,7 @@ free_parsestate(ParseState *pstate)
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*/
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if (pstate->p_next_resno-1>MaxTupleAttributeNumber)
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ereport(ERROR,
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(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
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(errcode(ERRCODE_TOO_MANY_COLUMNS),
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errmsg("target lists can have at most %d entries",
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MaxTupleAttributeNumber)));
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