linux-kernel - [PATCH -tip and 2.6.33-rc8] [BUGFIX] perf probe: Init struct probe

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Date:	Thu, 18 Feb 2010 13:16:52 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>
Cc:	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH -tip and 2.6.33-rc8] [BUGFIX] perf probe: Init struct
	probe_point and set counter correctly

Clear struct probe_point before using it in show_perf_probe_events(),
and set pp->found counter correctly in synthesize_perf_probe_point().
Without this initialization, clear_probe_point() will free random
addresses.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Ingo Molnar <mingo@...e.hu>
---

 tools/perf/util/probe-event.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 29465d4..fde17b0 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -272,6 +272,7 @@ int synthesize_perf_probe_point(struct probe_point *pp)
 	int ret;
 
 	pp->probes[0] = buf = zalloc(MAX_CMDLEN);
+	pp->found = 1;
 	if (!buf)
 		die("Failed to allocate memory by zalloc.");
 	if (pp->offset) {
@@ -294,6 +295,7 @@ int synthesize_perf_probe_point(struct probe_point *pp)
 error:
 		free(pp->probes[0]);
 		pp->probes[0] = NULL;
+		pp->found = 0;
 	}
 	return ret;
 }
@@ -455,6 +457,7 @@ void show_perf_probe_events(void)
 	struct strlist *rawlist;
 	struct str_node *ent;
 
+	memset(&pp, 0, sizeof(pp));
 	fd = open_kprobe_events(O_RDONLY, 0);
 	rawlist = get_trace_kprobe_event_rawlist(fd);
 	close(fd);


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com
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