perf tools: Fix memory leak when synthesizing thread records

Checking default guest machine should be done before allocating event
structures otherwise it'll leak memory.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Link: http://lkml.kernel.org/r/87ob15tx6a.fsf@sejong.aot.lge.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index ebb48a6..9d12aa6 100644 (file)
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -446,6 +446,9 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
        union perf_event *comm_event, *mmap_event, *fork_event;
        int err = -1;
 
+       if (machine__is_default_guest(machine))
+               return 0;
+
        comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
        if (comm_event == NULL)
                goto out;
@@ -458,9 +461,6 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
        if (fork_event == NULL)
                goto out_free_mmap;
 
-       if (machine__is_default_guest(machine))
-               return 0;
-
        snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
        proc = opendir(proc_path);