From: Wang Nan <wangnan0@huawei.com>
Date: Sun, 17 May 2015 10:56:27 +0000 (+0000)
Subject: perf tools: Set vmlinux_path__nr_entries to 0 in vmlinux_path__exit
X-Git-Tag: v4.9.8~4119^2~43^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c4f035473d93c1594d8225f6dd97332317820801;p=platform%2Fkernel%2Flinux-rpi3.git

perf tools: Set vmlinux_path__nr_entries to 0 in vmlinux_path__exit

Original vmlinux_path__exit() doesn't revert vmlinux_path__nr_entries to
its original state. After the while loop vmlinux_path__nr_entries
becomes -1 instead of 0.

This makes a problem that, if runs twice, during the second run
vmlinux_path__init() will set vmlinux_path[-1] to strdup("vmlinux"),
corrupts random memory.

This patch reset vmlinux_path__nr_entries to 0 after the while loop.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexei Starovoitov <ast@plumgrid.com
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: pi3orama@163.com
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/r/1431860222-61636-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 9ef8b89..82a31fd 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1819,6 +1819,7 @@ static void vmlinux_path__exit(void)
 {
 	while (--vmlinux_path__nr_entries >= 0)
 		zfree(&vmlinux_path[vmlinux_path__nr_entries]);
+	vmlinux_path__nr_entries = 0;
 
 	zfree(&vmlinux_path);
 }