linux-kernel - [PATCH 3/3] perf script: Fix crash because of missing feat

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Date:   Wed, 20 Jun 2018 19:00:30 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     acme@...nel.org, jolsa@...hat.com
Cc:     alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        dsahern@...il.com, davidcc@...gle.com, ak@...ux.intel.com,
        yao.jin@...ux.intel.com, linux-kernel@...r.kernel.org,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: [PATCH 3/3] perf script: Fix crash because of missing feat_op[] entry

perf_event__process_feature() tries to access feat_ops[feat].process
which is not defined for feat = HEADER_LAST_FEATURE and thus perf is
crashing. Add dummy entry for HEADER_LAST_FEATURE in the feat_ops.

Before:
  # ./perf record -o - ls | ./perf script
  Segmentation fault (core dumped)

After:
  # ./perf record -o - ls | ./perf script
  ls 7031 4392.099856:  250000 cpu-clock:uhH:  7f5e0ce7cd60
  ls 7031 4392.100355:  250000 cpu-clock:uhH:  7f5e0c706ef7

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Fixes: 57b5de463925 ("perf report: Support forced leader feature in pipe mode")
---
 tools/perf/util/header.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 540cd2dcd3e7..de8e3e29d870 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2555,14 +2555,18 @@ struct feature_ops {
 	}
 
 /* feature_ops not implemented: */
+#define write_last_feature	NULL
+
 #define print_tracing_data	NULL
 #define print_build_id		NULL
+#define print_last_feature	NULL
 
 #define process_branch_stack	NULL
 #define process_stat		NULL
+#define process_last_feature	NULL
 
 
-static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
+static const struct feature_ops feat_ops[HEADER_LAST_FEATURE + 1] = {
 	FEAT_OPN(TRACING_DATA,	tracing_data,	false),
 	FEAT_OPN(BUILD_ID,	build_id,	false),
 	FEAT_OPR(HOSTNAME,	hostname,	false),
@@ -2585,6 +2589,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
 	FEAT_OPN(CACHE,		cache,		true),
 	FEAT_OPR(SAMPLE_TIME,	sample_time,	false),
 	FEAT_OPR(MEM_TOPOLOGY,	mem_topology,	true),
+	FEAT_OPN(LAST_FEATURE,	last_feature,	false),
 };
 
 struct header_print_data {
-- 
2.14.4