perf machine: Fix __machine__findnew_thread() error path

When thread__init_map_groups() fails, a new thread should be removed
from the rbtree since it's gonna be freed.  Also update last match cache
only if the function succeeded.

Reported-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1420763892-15535-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 94de3e4..1bca3a9 100644 (file)
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -389,7 +389,6 @@ static struct thread *__machine__findnew_thread(struct machine *machine,
        if (th != NULL) {
                rb_link_node(&th->rb_node, parent, p);
                rb_insert_color(&th->rb_node, &machine->threads);
-               machine->last_match = th;
 
                /*
                 * We have to initialize map_groups separately
@@ -400,9 +399,12 @@ static struct thread *__machine__findnew_thread(struct machine *machine,
                 * leader and that would screwed the rb tree.
                 */
                if (thread__init_map_groups(th, machine)) {
+                       rb_erase(&th->rb_node, &machine->threads);
                        thread__delete(th);
                        return NULL;
                }
+
+               machine->last_match = th;
        }
 
        return th;