linux-kernel - [tip:perf/core] perf sort: Fix segfault with basic block 'cycles' sort dimension

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Message-ID: <tip-4b0b3aa6a2756e6115fdf275c521e4552a7082f3@git.kernel.org>
Date:   Wed, 15 Mar 2017 11:37:23 -0700
From:   tip-bot for Changbin Du <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     ak@...ux.intel.com, tglx@...utronix.de, acme@...hat.com,
        hpa@...or.com, changbin.du@...el.com, peterz@...radead.org,
        mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf sort: Fix segfault with basic block 'cycles'
 sort dimension

Commit-ID:  4b0b3aa6a2756e6115fdf275c521e4552a7082f3
Gitweb:     http://git.kernel.org/tip/4b0b3aa6a2756e6115fdf275c521e4552a7082f3
Author:     Changbin Du <changbin.du@...el.com>
AuthorDate: Mon, 13 Mar 2017 16:31:48 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 13 Mar 2017 11:41:20 -0300

perf sort: Fix segfault with basic block 'cycles' sort dimension

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

The fault can be reproduced by:

  perf record -a
  perf report -F cycles

Signed-off-by: Changbin Du <changbin.du@...el.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Fixes: 0e332f033a82 ("perf tools: Add support for cycles, weight branch_info field")
Link: http://lkml.kernel.org/r/20170313083148.23568-1-changbin.du@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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 f8f16c0..93f755a 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,