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[PATCH 21/32] perf probe: Reset args and nargs for probe_trace_event when failure

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When failure occures in add_probe_trace_event(), args in
probe_trace_event is incomplete. Since information in it may be used
in further, this patch frees the allocated memory and set it to NULL
to avoid dangling pointer.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
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: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lkml.kernel.org/n/1436445342-1402-31-git-send-email-wangnan0@huawei.com
---
 tools/perf/util/probe-finder.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 29c43c068..5ab9cd6 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1228,6 +1228,10 @@ static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf)
 
 end:
 	free(args);
+	if (ret) {
+		tev->nargs = 0;
+		zfree(&tev->args);
+	}
 	return ret;
 }
 
-- 
2.1.0

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[GIT PULL 00/32] perf tools: filtering events using eBPF programs Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:10 +0200
  [PATCH 11/32] perf tools: Add bpf_fd field to evsel and config it Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 03/32] perf tools: Introduce dummy evsel Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 14/32] perf tools: Suppress probing messages when probing by BPF loading Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 07/32] perf probe: Attach trace_probe_event with perf_probe_event Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 08/32] perf record, bpf: Parse and probe eBPF programs probe points Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 02/32] perf tools: Don't set cmdline_group_boundary if no evsel is collected Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 28/32] perf record: Support custom vmlinux path Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 12/32] perf tools: Allow filter option to be applied to bof object Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 27/32] perf tools: Use same BPF program if arguments are identical Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 04/32] perf tools: Make perf depend on libbpf Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 09/32] perf bpf: Collect 'struct perf_probe_event' for bpf_program Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 21/32] perf probe: Reset args and nargs for probe_trace_event when failure Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 16/32] perf tools: Infrastructure for compiling scriptlets when passing '.c' to --event Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 24/32] perf tools: Introduce arch_get_reg_info() for x86 Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 15/32] perf record: Add clang options for compiling BPF scripts Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 18/32] perf test: Add 'perf test BPF' Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 19/32] bpf tools: Load a program with different instances using preprocessor Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 13/32] perf tools: Attach eBPF program to perf event Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  [PATCH 05/32] perf ebpf: Add the libbpf glue Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
  Re: [GIT PULL 00/32] perf tools: filtering events using eBPF programs Alexei Starovoitov <ast@plumgrid.com> - 2015-08-29 02:30 +0200
    Re: [GIT PULL 00/32] perf tools: filtering events using eBPF programs Arnaldo Carvalho de Melo <acme@redhat.com> - 2015-08-31 16:00 +0200
      Re: [GIT PULL 00/32] perf tools: filtering events using eBPF programs "Wangnan (F)" <wangnan0@huawei.com> - 2015-08-31 16:20 +0200

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