tracing/filters: Always free pred on filter_add_subsystem_pred() failure

If filter_add_subsystem_pred() fails due to ENOSPC or ENOMEM,
the pred doesn't get freed, while as a side effect it does for
other errors. Make it so the caller always frees the pred for
any error.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <1249746593.6453.32.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 1557148..f32dc9d 100644 (file)
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -624,9 +624,6 @@ static int filter_add_subsystem_pred(struct filter_parse_state *ps,
                return -ENOSPC;
        }
 
-       filter->preds[filter->n_preds] = pred;
-       filter->n_preds++;
-
        list_for_each_entry(call, &ftrace_events, list) {
 
                if (!call->define_fields)
@@ -643,6 +640,9 @@ static int filter_add_subsystem_pred(struct filter_parse_state *ps,
                }
                replace_filter_string(call->filter, filter_string);
        }
+
+       filter->preds[filter->n_preds] = pred;
+       filter->n_preds++;
 out:
        return err;
 }
@@ -1034,9 +1034,12 @@ static int replace_preds(struct event_subsystem *system,
                        if (call) {
                                err = filter_add_pred(ps, call, pred);
                                filter_free_pred(pred);
-                       } else
+                       } else {
                                err = filter_add_subsystem_pred(ps, system,
                                                        pred, filter_string);
+                               if (err)
+                                       filter_free_pred(pred);
+                       }
                        if (err)
                                return err;
 
@@ -1055,9 +1058,12 @@ static int replace_preds(struct event_subsystem *system,
                if (call) {
                        err = filter_add_pred(ps, call, pred);
                        filter_free_pred(pred);
-               } else
+               } else {
                        err = filter_add_subsystem_pred(ps, system, pred,
                                                        filter_string);
+                       if (err)
+                               filter_free_pred(pred);
+               }
                if (err)
                        return err;