[PATCH v13 24/32] perf timechart: Fix memory leaks

[Ian Rogers <irogers@google.com>]

Fix missing free from cat_backtrace, which requires copies of the
backtrace being made in functions that save it.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/builtin-timechart.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 1d24d8738519..64f69bd67c6b 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -299,7 +299,7 @@ static void pid_put_sample(struct timechart *tchart, int pid, int type,
 	sample->type = type;
 	sample->next = c->samples;
 	sample->cpu = cpu;
-	sample->backtrace = backtrace;
+	sample->backtrace = backtrace ? strdup(backtrace) : NULL;
 	c->samples = sample;
 
 	if (sample->type == TYPE_RUNNING && end > start && start > 0) {
@@ -433,7 +433,7 @@ static void sched_wakeup(struct timechart *tchart, int cpu, u64 timestamp,
 
 	we->time = timestamp;
 	we->waker = waker;
-	we->backtrace = backtrace;
+	we->backtrace = backtrace ? strdup(backtrace) : NULL;
 
 	if ((flags & TRACE_FLAG_HARDIRQ) || (flags & TRACE_FLAG_SOFTIRQ))
 		we->waker = -1;
@@ -489,9 +489,9 @@ static void sched_switch(struct timechart *tchart, int cpu, u64 timestamp,
 	}
 }
 
-static const char *cat_backtrace(union perf_event *event,
-				 struct perf_sample *sample,
-				 struct machine *machine)
+static char *cat_backtrace(union perf_event *event,
+			   struct perf_sample *sample,
+			   struct machine *machine)
 {
 	struct addr_location al;
 	unsigned int i;
@@ -544,8 +544,10 @@ static const char *cat_backtrace(union perf_event *event,
 				 * It seems the callchain is corrupted.
 				 * Discard all.
 				 */
-				zfree(&p);
-				goto exit;
+				addr_location__exit(&al);
+				fclose(f);
+				free(p);
+				return NULL;
 			}
 			continue;
 		}
@@ -577,6 +579,7 @@ static int process_sample_event(const struct perf_tool *tool,
 {
 	struct timechart *tchart = container_of(tool, struct timechart, tool);
 	struct evsel *evsel = sample->evsel;
+	int ret = 0;
 
 	if (evsel->core.attr.sample_type & PERF_SAMPLE_TIME) {
 		if (!tchart->first_time || tchart->first_time > sample->time)
@@ -587,11 +590,13 @@ static int process_sample_event(const struct perf_tool *tool,
 
 	if (evsel->handler != NULL) {
 		tracepoint_handler f = evsel->handler;
+		char *backtrace = cat_backtrace(event, sample, machine);
 
-		return f(tchart, sample, cat_backtrace(event, sample, machine));
+		ret = f(tchart, sample, backtrace);
+		free(backtrace);
 	}
 
-	return 0;
+	return ret;
 }
 
 static int
-- 
2.54.0.563.g4f69b47b94-goog