linux-kernel - [tip:perf/urgent] perf header: Set nr_numa_nodes only when we parsed all the data

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Date:   Mon, 17 Oct 2016 07:52:30 -0700
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        namhyung@...nel.org, dsahern@...il.com, acme@...hat.com,
        jolsa@...nel.org, hpa@...or.com, wangnan0@...wei.com,
        sukadev@...ux.vnet.ibm.com, adrian.hunter@...el.com,
        mingo@...nel.org
Subject: [tip:perf/urgent] perf header: Set nr_numa_nodes only when we
 parsed all the data

Commit-ID:  f957a5308dbbdf67aa4f8ac3233a61e802bd2373
Gitweb:     http://git.kernel.org/tip/f957a5308dbbdf67aa4f8ac3233a61e802bd2373
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Mon, 10 Oct 2016 09:56:32 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 13 Oct 2016 11:12:29 -0300

perf header: Set nr_numa_nodes only when we parsed all the data

Sukadev reported segfault on releasing perf env's numa data.  It's due
to nr_numa_nodes being set no matter if the numa data gets parsed
properly. The perf_env__exit crash the on releasing non existed data.

Setting nr_numa_nodes only when data are parsed out properly.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Reported-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-dt9c0zgkt4hybn2cr4xiawta@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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 85dd0db..2f3eded 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1895,7 +1895,6 @@ static int process_numa_topology(struct perf_file_section *section __maybe_unuse
 	if (ph->needs_swap)
 		nr = bswap_32(nr);
 
-	ph->env.nr_numa_nodes = nr;
 	nodes = zalloc(sizeof(*nodes) * nr);
 	if (!nodes)
 		return -ENOMEM;
@@ -1932,6 +1931,7 @@ static int process_numa_topology(struct perf_file_section *section __maybe_unuse
 
 		free(str);
 	}
+	ph->env.nr_numa_nodes = nr;
 	ph->env.numa_nodes = nodes;
 	return 0;