[tip: perf/urgent] perf probe: Fix to clear tev->nargs in clear_probe_trace_event() - tip-bot2 for Masami Hiramatsu

From: "tip-bot2 for Masami Hiramatsu" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Wang Nan <wangnan0@huawei.com>, Ingo Molnar <mingo@kernel.org>,
	Borislav Petkov <bp@alien8.de>,
	linux-kernel@vger.kernel.org
Subject: [tip: perf/urgent] perf probe: Fix to clear tev->nargs in clear_probe_trace_event()
Date: Sun, 22 Sep 2019 10:52:24 -0000	[thread overview]
Message-ID: <156914954430.24167.14701079319060500126.tip-bot2@tip-bot2> (raw)
In-Reply-To: <156856587999.25775.5145779959474477595.stgit@devnote2>

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     9e6124d9d635957b56717f85219a88701617253f
Gitweb:        https://git.kernel.org/tip/9e6124d9d635957b56717f85219a88701617253f
Author:        Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate:    Mon, 16 Sep 2019 01:44:40 +09:00
Committer:     Arnaldo Carvalho de Melo <acme@redhat.com>
CommitterDate: Fri, 20 Sep 2019 15:30:09 -03:00

perf probe: Fix to clear tev->nargs in clear_probe_trace_event()

Since add_probe_trace_event() can reuse tf->tevs[i] after calling
clear_probe_trace_event(), this can make perf-probe crash if the 1st
attempt of probe event finding fails to find an event argument, and the
2nd attempt fails to find probe point.

E.g.
  $ perf probe -D "task_pid_nr tsk"
  Failed to find 'tsk' in this function.
  Failed to get entry address of warn_bad_vsyscall
  Segmentation fault (core dumped)

Committer testing:

After the patch:

  $ perf probe -D "task_pid_nr tsk"
  Failed to find 'tsk' in this function.
  Failed to get entry address of warn_bad_vsyscall
  Failed to get entry address of signal_fault
  Failed to get entry address of show_signal
  Failed to get entry address of umip_printk
  Failed to get entry address of __bad_area_nosemaphore
  <SNIP>
  Failed to get entry address of sock_set_timeout
  Failed to get entry address of tcp_recvmsg
  Probe point 'task_pid_nr' not found.
    Error: Failed to add events.
  $

Fixes: 092b1f0b5f9f ("perf probe: Clear probe_trace_event when add_probe_trace_event() fails")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lore.kernel.org/lkml/156856587999.25775.5145779959474477595.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/probe-event.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index b8e0967..91cab5f 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2331,6 +2331,7 @@ void clear_probe_trace_event(struct probe_trace_event *tev)
 		}
 	}
 	zfree(&tev->args);
+	tev->nargs = 0;
 }
 
 struct kprobe_blacklist_node {
