linux-kernel - [PATCH 15/15] perf annotate: Fix segfault with source toggle

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Date:   Fri, 28 Feb 2020 11:00:14 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>, Ian Rogers <irogers@...gle.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Song Liu <songliubraving@...com>
Subject: [PATCH 15/15] perf annotate: Fix segfault with source toggle

From: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>

While rendering annotate browser from perf report tui, we keep track
of total number of lines(asm + source) in annotation->nr_entries and
total number of asm lines in annotation->nr_asm_entries. But we don't
reset them before starting. Thus if user annotates same function
multiple times, we restart incrementing these fields with old values.

This causes a segfault when user tries to toggle source code after
annotating same function multiple times. Fix it.

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Acked-by: Jiri Olsa <jolsa@...hat.com>
Cc: Ian Rogers <irogers@...gle.com>
Cc: Jin Yao <yao.jin@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Song Liu <songliubraving@...com>
Link: http://lore.kernel.org/lkml/20200204045233.474937-5-ravi.bangoria@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/annotate.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index c816e5840166..0ea95be84b3b 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -2621,6 +2621,8 @@ void annotation__set_offsets(struct annotation *notes, s64 size)
 	struct annotation_line *al;
 
 	notes->max_line_len = 0;
+	notes->nr_entries = 0;
+	notes->nr_asm_entries = 0;
 
 	list_for_each_entry(al, &notes->src->source, node) {
 		size_t line_len = strlen(al->line);
-- 
2.21.1