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Ensure that PLPGSQL_DTYPE_ROW variables have valid refname fields.

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Without this, the syntax-tree-dumping functions in pl_funcs.c crash,
and there are other places that might be at risk too.  Per report
from Pavel Stehule.

Looks like I broke this in commit f9263006d, so back-patch to v11.

Discussion: https://postgr.es/m/CAFj8pRA+3f5n4642q2g8BXCKjbTd7yU9JMYAgDyHgozk6cQ-VA@mail.gmail.com
This commit is contained in:
Tom Lane 2018-10-05 12:45:37 -04:00
parent 40159d91cc
commit 6e526b7870
4 changed files with 12 additions and 1 deletions
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2
src/pl/plpgsql/src/pl_comp.c
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@ -1896,6 +1896,8 @@ build_row_from_vars(PLpgSQL_variable **vars, int numvars)
row = palloc0(sizeof(PLpgSQL_row));
row->dtype = PLPGSQL_DTYPE_ROW;
row->refname = "(unnamed row)";
row->lineno = -1;
row->rowtupdesc = CreateTemplateTupleDesc(numvars, false);
row->nfields = numvars;
row->fieldnames = palloc(numvars * sizeof(char *));

1
src/pl/plpgsql/src/pl_exec.c
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@ -2205,6 +2205,7 @@ exec_stmt_call(PLpgSQL_execstate *estate, PLpgSQL_stmt_call *stmt)
row = palloc0(sizeof(*row));
row->dtype = PLPGSQL_DTYPE_ROW;
row->refname = "(unnamed row)";
row->lineno = -1;
row->varnos = palloc(sizeof(int) * FUNC_MAX_ARGS);

3
src/pl/plpgsql/src/pl_gram.y
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@ -613,6 +613,7 @@ decl_cursor_args :
new = palloc0(sizeof(PLpgSQL_row));
new->dtype = PLPGSQL_DTYPE_ROW;
new->refname = "(unnamed row)";
new->lineno = plpgsql_location_to_lineno(@1);
new->rowtupdesc = NULL;
new->nfields = list_length($2);
@ -3526,6 +3527,7 @@ read_into_scalar_list(char *initial_name,
row = palloc0(sizeof(PLpgSQL_row));
row->dtype = PLPGSQL_DTYPE_ROW;
row->refname = "(unnamed row)";
row->lineno = plpgsql_location_to_lineno(initial_location);
row->rowtupdesc = NULL;
row->nfields = nfields;
@ -3560,6 +3562,7 @@ make_scalar_list1(char *initial_name,
row = palloc0(sizeof(PLpgSQL_row));
row->dtype = PLPGSQL_DTYPE_ROW;
row->refname = "(unnamed row)";
row->lineno = lineno;
row->rowtupdesc = NULL;
row->nfields = 1;

7
src/pl/plpgsql/src/plpgsql.h
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@ -326,7 +326,12 @@ typedef struct PLpgSQL_var
* Note that there's no way to name the row as such from PL/pgSQL code,
* so many functions don't need to support these.
*
* refname, isconst, notnull, and default_val are unsupported (and hence
* That also means that there's no real name for the row variable, so we
* conventionally set refname to "(unnamed row)". We could leave it NULL,
* but it's too convenient to be able to assume that refname is valid in
* all variants of PLpgSQL_variable.
*
* isconst, notnull, and default_val are unsupported (and hence
* always zero/null) for a row. The member variables of a row should have
* been checked to be writable at compile time, so isconst is correctly set
* to false. notnull and default_val aren't applicable.