linux-kernel - [PATCH] perf: assign proper ff->ph in perf_event__synthesize

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Date:   Wed, 19 Jun 2019 18:04:53 -0700
From:   Song Liu <songliubraving@...com>
To:     <linux-kernel@...r.kernel.org>
CC:     <kernel-team@...com>, <acme@...hat.com>, <davidca@...com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>,
        Song Liu <songliubraving@...com>, <stable@...r.kernel.org>
Subject: [PATCH] perf: assign proper ff->ph in perf_event__synthesize_features()

bpf/btf  write_* functions need ff->ph->env.

With this missing, pipe-mode (perf record -o -)  would crash like:

Program terminated with signal SIGSEGV, Segmentation fault.

This patch assign proper ph value to ff.

Cc: stable@...r.kernel.org #v5.1+
Fixes: 606f972b1361 ("perf bpf: Save bpf_prog_info information as headers to perf.data")
Reported-by: David Carrillo Cisneros <davidca@...com>
Signed-off-by: Song Liu <songliubraving@...com>
---
 tools/perf/util/header.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 06ddb6618ef3..5f1aa0284e1b 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -3684,6 +3684,7 @@ int perf_event__synthesize_features(struct perf_tool *tool,
 		return -ENOMEM;
 
 	ff.size = sz - sz_hdr;
+	ff.ph = &session->header;
 
 	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
 		if (!feat_ops[feat].synthesize) {
-- 
2.17.1