linux-kernel - [PATCH] perf sort: Segmentation fault of basic block cycles sort dimension

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Date:   Mon, 13 Mar 2017 16:31:48 +0800
From:   changbin.du@...el.com
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org
Cc:     linux-kernel@...r.kernel.org, Changbin Du <changbin.du@...el.com>
Subject: [PATCH] perf sort: Segmentation fault of basic block cycles sort dimension

From: Changbin Du <changbin.du@...el.com>

Skip the sample which doesn't have branch_info to avoid segmentation
fault occurrence.

The fault can be reproduced by:
perf record -a
perf report -F cycles

Signed-off-by: Changbin Du <changbin.du@...el.com>
---
 tools/perf/util/sort.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 0ff6222..b6db140 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -846,6 +846,9 @@ static int hist_entry__mispredict_snprintf(struct hist_entry *he, char *bf,
 static int64_t
 sort__cycles_cmp(struct hist_entry *left, struct hist_entry *right)
 {
+	if (!left->branch_info || !right->branch_info)
+		return cmp_null(left->branch_info, right->branch_info);
+
 	return left->branch_info->flags.cycles -
 		right->branch_info->flags.cycles;
 }
@@ -853,6 +856,8 @@ sort__cycles_cmp(struct hist_entry *left, struct hist_entry *right)
 static int hist_entry__cycles_snprintf(struct hist_entry *he, char *bf,
 				    size_t size, unsigned int width)
 {
+	if (!he->branch_info)
+		return scnprintf(bf, size, "%-.*s", width, "N/A");
 	if (he->branch_info->flags.cycles == 0)
 		return repsep_snprintf(bf, size, "%-*s", width, "-");
 	return repsep_snprintf(bf, size, "%-*hd", width,
-- 
2.7.4