[PATCH 7/9] perf metric: Do not free metric when failed to resolve

[Namhyung Kim]

It's dangerous to free the original metric when it's called from
resolve_metric() as it's already in the metric_list and might have
other resources too.  Instead, it'd better let them bail out and be
released properly at the later stage.

So add a check when it's called from metricgroup__add_metric() and
release it.  Also make sure that mp is set properly.

Fixes: 83de0b7d535de ("perf metric: Collect referenced metrics in struct 
metric_ref_node")
Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
 tools/perf/util/metricgroup.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index c8904e471a71..ab5030fcfed4 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -672,7 +672,6 @@ static int __add_metric(struct list_head *metric_list,
                m->has_constraint = metric_no_group || 
metricgroup__has_constraint(pe);
                INIT_LIST_HEAD(&m->metric_refs);
                m->metric_refs_cnt = 0;
-               *mp = m;
 
                parent = expr_ids__alloc(ids);
                if (!parent) {
@@ -685,6 +684,7 @@ static int __add_metric(struct list_head *metric_list,
                        free(m);
                        return -ENOMEM;
                }
+               *mp = m;
        } else {
                /*
                 * We got here for the referenced metric, via the
@@ -719,8 +719,11 @@ static int __add_metric(struct list_head *metric_list,
         * all the metric's IDs and add it to the parent context.
         */
        if (expr__find_other(pe->metric_expr, NULL, &m->pctx, runtime) < 0) {
-               expr__ctx_clear(&m->pctx);
-               free(m);
+               if (m->metric_refs_cnt == 0) {
+                       expr__ctx_clear(&m->pctx);
+                       free(m);
+                       *mp = NULL;
+               }
                return -EINVAL;
        }
 
-- 
2.28.0.526.ge36021eeef-goog