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Initialize unused ExprEvalStep fields. 

ExecPushExprSlots didn't initialize ExprEvalStep's resvalue/resnull
steps as it didn't use them. That caused wrong valgrind warnings for
an upcoming patch, so zero-intialize.

Also zero-initialize all scratch ExprEvalStep's allocated on the
stack, to avoid issues with similar future omissions of non-critial
data.
This commit is contained in:
Andres Freund 2018-01-23 23:20:02 -08:00
parent 1e1e599d66
commit fc96c69425
1 changed files with 11 additions and 8 deletions
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19
src/backend/executor/execExpr.c
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@ -118,7 +118,7 @@ ExprState *
ExecInitExpr(Expr *node, PlanState *parent)
{
ExprState *state;
ExprEvalStep scratch;
ExprEvalStep scratch = {0};
/* Special case: NULL expression produces a NULL ExprState pointer */
if (node == NULL)
@ -155,7 +155,7 @@ ExprState *
ExecInitExprWithParams(Expr *node, ParamListInfo ext_params)
{
ExprState *state;
ExprEvalStep scratch;
ExprEvalStep scratch = {0};
/* Special case: NULL expression produces a NULL ExprState pointer */
if (node == NULL)
@ -204,7 +204,7 @@ ExprState *
ExecInitQual(List *qual, PlanState *parent)
{
ExprState *state;
ExprEvalStep scratch;
ExprEvalStep scratch = {0};
List *adjust_jumps = NIL;
ListCell *lc;
@ -353,7 +353,7 @@ ExecBuildProjectionInfo(List *targetList,
{
ProjectionInfo *projInfo = makeNode(ProjectionInfo);
ExprState *state;
ExprEvalStep scratch;
ExprEvalStep scratch = {0};
ListCell *lc;
projInfo->pi_exprContext = econtext;
@ -638,7 +638,7 @@ static void
ExecInitExprRec(Expr *node, ExprState *state,
Datum *resv, bool *resnull)
{
ExprEvalStep scratch;
ExprEvalStep scratch = {0};
/* Guard against stack overflow due to overly complex expressions */
check_stack_depth();
@ -2273,7 +2273,10 @@ ExecInitExprSlots(ExprState *state, Node *node)
static void
ExecPushExprSlots(ExprState *state, LastAttnumInfo *info)
{
ExprEvalStep scratch;
ExprEvalStep scratch = {0};
scratch.resvalue = NULL;
scratch.resnull = NULL;
/* Emit steps as needed */
if (info->last_inner > 0)
@ -2659,7 +2662,7 @@ static void
ExecInitCoerceToDomain(ExprEvalStep *scratch, CoerceToDomain *ctest,
ExprState *state, Datum *resv, bool *resnull)
{
ExprEvalStep scratch2;
ExprEvalStep scratch2 = {0};
DomainConstraintRef *constraint_ref;
Datum *domainval = NULL;
bool *domainnull = NULL;
@ -2811,7 +2814,7 @@ ExecBuildAggTrans(AggState *aggstate, AggStatePerPhase phase,
{
ExprState *state = makeNode(ExprState);
PlanState *parent = &aggstate->ss.ps;
ExprEvalStep scratch;
ExprEvalStep scratch = {0};
int transno = 0;
int setoff = 0;
bool isCombine = DO_AGGSPLIT_COMBINE(aggstate->aggsplit);