perf annotate-data: Fix a buffer overflow in TUI browser

In get_member_overhead(), k is updated when it has a entry in the
histogram.  But the entry->hists array is allocated with the number of
evsel in the group.  So the k should be reset when it iterates the event
using for_each_group_evsel(), otherwise it'd crash due to a buffer
overflow.

Fixes: cb1898f58e0f175d ("perf annotate-data: Support --skip-empty option")
Signed-off-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

1 files changed, 2 insertions, 1 deletions

diff --git a/tools/perf/ui/browsers/annotate-data.c b/tools/perf/ui/browsers/annotate-data.c
index c3db80a7589a..a937b55da736 100644
--- a/tools/perf/ui/browsers/annotate-data.c
+++ b/tools/perf/ui/browsers/annotate-data.c
@@ -46,11 +46,12 @@ static int get_member_overhead(struct annotated_data_type *adt,
 	struct annotated_member *member = entry->data;
 	int i, k;
 
-	for (i = 0, k = 0; i < member->size; i++) {
+	for (i = 0; i < member->size; i++) {
 		struct type_hist *h;
 		struct evsel *evsel;
 		int offset = member->offset + i;
 
+		k = 0;
 		for_each_group_evsel(evsel, leader) {
 			if (symbol_conf.skip_empty &&
 			    evsel__hists(evsel)->stats.nr_samples == 0)