diff options
| author | Li Zefan <[email protected]> | 2009-09-01 13:31:38 +0800 |
|---|---|---|
| committer | Frederic Weisbecker <[email protected]> | 2009-09-04 23:22:33 +0200 |
| commit | c58b43218c1a04a0bcf338ea47406c759ac28e11 (patch) | |
| tree | e13e33f195a13b4c959494ee7d059b87c2167be3 | |
| parent | 8e254c1d183f0225ad21f9049641529e56cce4da (diff) | |
tracing/filters: Defer pred allocation, fix memory leak
The predicates of an event and their filter structure are allocated
when we create an event filter for the first time.
These objects must be created once but each time we come with a new
filter, we overwrite such pre-existing allocation, if any.
Thus, this patch checks if the filter has already been allocated
before going ahead.
Spotted-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Li Zefan <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Tom Zanussi <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
| -rw-r--r-- | kernel/trace/trace_events_filter.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index c6b2edfb7fe9..93660fbbf629 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -409,6 +409,9 @@ static int init_preds(struct ftrace_event_call *call) struct filter_pred *pred; int i; + if (call->filter) + return 0; + filter = call->filter = kzalloc(sizeof(*filter), GFP_KERNEL); if (!call->filter) return -ENOMEM; @@ -447,11 +450,9 @@ static int init_subsystem_preds(struct event_subsystem *system) if (strcmp(call->system, system->name) != 0) continue; - if (!call->filter) { - err = init_preds(call); - if (err) - return err; - } + err = init_preds(call); + if (err) + return err; } return 0; |