Re: [2.6.31 PATCH] tracing/filters: always free pred on filter_add_subsystem_pred() failure

[Ingo Molnar <mingo@elte.hu>]

* Tom Zanussi <tzanussi@gmail.com> wrote:

> 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.

thanks, i've queued this up for .31.

Just to make sure: tracing/core has the filter code changed 
substantially, and this issue seems to be moot there - correct?

So the total impact from both patches on -tip is the patch below - 
right?

	Ingo

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 27c2dbe..490337a 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1050,6 +1050,8 @@ static int replace_preds(struct event_subsystem *system,
 
 		pred = create_pred(elt->op, operand1, operand2);
 add_pred:
+		if (!pred)
+			return -ENOMEM;
 		if (call)
 			err = filter_add_pred(ps, call, pred, false);
 		else