linux-kernel - [PATCH 2/2] perf annotate-data: Ensure the number of type histograms

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Date: Fri, 10 May 2024 14:04:52 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org
Subject: [PATCH 2/2] perf annotate-data: Ensure the number of type histograms

Arnaldo reported that there is a case where nr_histograms and histograms
don't agree each other.  It ended up in a segfault trying to access NULL
histograms array.  Let's make sure to update the nr_histograms when the
histograms array is changed.

Reported-by: Arnaldo Carvalho de Melo <acme@...nel.org>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/annotate-data.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/annotate-data.c b/tools/perf/util/annotate-data.c
index 57e7d4b3550b..965da6c0b542 100644
--- a/tools/perf/util/annotate-data.c
+++ b/tools/perf/util/annotate-data.c
@@ -1800,7 +1800,6 @@ static int alloc_data_type_histograms(struct annotated_data_type *adt, int nr_en
 	sz += sizeof(struct type_hist_entry) * adt->self.size;
 
 	/* Allocate a table of pointers for each event */
-	adt->nr_histograms = nr_entries;
 	adt->histograms = calloc(nr_entries, sizeof(*adt->histograms));
 	if (adt->histograms == NULL)
 		return -ENOMEM;
@@ -1814,6 +1813,8 @@ static int alloc_data_type_histograms(struct annotated_data_type *adt, int nr_en
 		if (adt->histograms[i] == NULL)
 			goto err;
 	}
+
+	adt->nr_histograms = nr_entries;
 	return 0;
 
 err:
@@ -1827,7 +1828,9 @@ static void delete_data_type_histograms(struct annotated_data_type *adt)
 {
 	for (int i = 0; i < adt->nr_histograms; i++)
 		zfree(&(adt->histograms[i]));
+
 	zfree(&adt->histograms);
+	adt->nr_histograms = 0;
 }
 
 void annotated_data_type__tree_delete(struct rb_root *root)
-- 
2.45.0.118.g7fe29c98d7-goog