diff options
| author | Tom Zanussi <tzanussi@gmail.com> | 2009-03-23 03:26:48 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-23 09:30:37 +0100 |
| commit | c4cff064be678f1e8344d907499f2a81282edc19 (patch) | |
| tree | 8c020dd399a8eba7ae279283e9a3eeb074c74d88 /kernel/trace | |
| parent | ee6cdabc820a29bd607f38d9cb335c3ceddc673b (diff) | |
tracing/filters: clean up filter_add_subsystem_pred()
Impact: cleanup, memory leak fix
This patch cleans up filter_add_subsystem_pred():
- searches for the field before creating a copy of the pred
- fixes memory leak in the case a predicate isn't applied
- if -ENOMEM, makes sure there's no longer a reference to the
pred so the caller can free the half-finished filter
- changes the confusing i == MAX_FILTER_PRED - 1 comparison
previously remarked upon
This affects only per-subsystem event filtering.
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1237796808.7527.40.camel@charm-linux>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace_events.c | 1 | ||||
| -rw-r--r-- | kernel/trace/trace_events_filter.c | 31 |
2 files changed, 25 insertions, 7 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 19f61dd2321..fdab30d6c83 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -585,6 +585,7 @@ subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, } if (filter_add_subsystem_pred(system, pred)) { + filter_free_subsystem_preds(system); filter_free_pred(pred); return -EINVAL; } diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index fd01d8022ad..4117c2ebc24 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -318,22 +318,39 @@ int filter_add_subsystem_pred(struct event_subsystem *system, system->preds[i] = pred; break; } - if (i == MAX_FILTER_PRED - 1) - return -EINVAL; } + if (i == MAX_FILTER_PRED) + return -EINVAL; + events_for_each(call) { + int err; + if (!call->name || !call->regfunc) continue; - if (!strcmp(call->system, system->name)) { - event_pred = copy_pred(pred); - if (event_pred) - filter_add_pred(call, event_pred); - } + if (strcmp(call->system, system->name)) + continue; + + if (!find_event_field(call, pred->field_name)) + continue; + + event_pred = copy_pred(pred); + if (!event_pred) + goto oom; + + err = filter_add_pred(call, event_pred); + if (err) + filter_free_pred(event_pred); + if (err == -ENOMEM) + goto oom; } return 0; + +oom: + system->preds[i] = NULL; + return -ENOMEM; } int filter_parse(char **pbuf, struct filter_pred *pred) |