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From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: David Carrillo-Cisneros <davidcc@google.com>,
	Song Liu <songliubraving@fb.com>,
	Kan Liang <kan.liang@linux.intel.com>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: [PATCH] perf tools: Fix proper buffer size for feature processing
Date: Mon, 15 Jul 2019 16:04:26 +0200
Message-ID: <20190715140426.32509-1-jolsa@kernel.org> (raw)

After Song Liu's segfault fix for pipe mode, Arnaldo reported
following error:

  # perf record -o - | perf script
  0x514 [0x1ac]: failed to process type: 80

It's caused by wrong buffer size setup in feature processing,
which makes cpu topology feature fail, because it's using
buffer size to recognize its header version.

Cc: David Carrillo-Cisneros <davidcc@google.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Fixes: e9def1b2e74e ("perf tools: Add feature header record to pipe-mode")
Link: http://lkml.kernel.org/n/tip-2lj87zz8tq9ye1ntax3ulw0n@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/header.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index c24db7f4909c..20111f8da5cb 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -3747,7 +3747,7 @@ int perf_event__process_feature(struct perf_session *session,
 		return 0;
 
 	ff.buf  = (void *)fe->data;
-	ff.size = event->header.size - sizeof(event->header);
+	ff.size = event->header.size - sizeof(*fe);
 	ff.ph = &session->header;
 
 	if (feat_ops[feat].process(&ff, NULL))
-- 
2.21.0


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-15 14:04 Jiri Olsa [this message]
2019-07-16 18:46 ` Arnaldo Carvalho de Melo
2019-07-23 21:48 ` [tip:perf/urgent] " tip-bot for Jiri Olsa

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