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tracing/events: fix memory leak when unloading module 

When unloading a module, memory allocated by init_preds() and
trace_define_field() is not freed.

[ Impact: fix memory leak ]

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <4A00F6E0.3040503@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-05-06 10:33:04 +08:00 committed by Ingo Molnar
parent 96d17980fa
commit 2df75e4157
3 changed files with 34 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/ftrace_event.h
View File

@ -116,6 +116,7 @@ struct ftrace_event_call {
#define MAX_FILTER_STR_VAL 128
extern int init_preds(struct ftrace_event_call *call);
extern void destroy_preds(struct ftrace_event_call *call);
extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
extern int filter_current_check_discard(struct ftrace_event_call *call,
void *rec,

18
kernel/trace/trace_events.c
View File

@ -60,6 +60,22 @@ err:
}
EXPORT_SYMBOL_GPL(trace_define_field);
#ifdef CONFIG_MODULES
static void trace_destroy_fields(struct ftrace_event_call *call)
{
struct ftrace_event_field *field, *next;
list_for_each_entry_safe(field, next, &call->fields, link) {
list_del(&field->link);
kfree(field->type);
kfree(field->name);
kfree(field);
}
}
#endif /* CONFIG_MODULES */
static void ftrace_clear_events(void)
{
struct ftrace_event_call *call;
@ -925,6 +941,8 @@ static void trace_module_remove_events(struct module *mod)
unregister_ftrace_event(call->event);
debugfs_remove_recursive(call->dir);
list_del(&call->list);
trace_destroy_fields(call);
destroy_preds(call);
}
}

22
kernel/trace/trace_events_filter.c
View File

@ -346,6 +346,20 @@ static void filter_disable_preds(struct ftrace_event_call *call)
filter->preds[i]->fn = filter_pred_none;
}
void destroy_preds(struct ftrace_event_call *call)
{
struct event_filter *filter = call->filter;
int i;
for (i = 0; i < MAX_FILTER_PRED; i++) {
if (filter->preds[i])
filter_free_pred(filter->preds[i]);
}
kfree(filter->preds);
kfree(filter);
call->filter = NULL;
}
int init_preds(struct ftrace_event_call *call)
{
struct event_filter *filter;
@ -374,13 +388,7 @@ int init_preds(struct ftrace_event_call *call)
return 0;
oom:
for (i = 0; i < MAX_FILTER_PRED; i++) {
if (filter->preds[i])
filter_free_pred(filter->preds[i]);
}
kfree(filter->preds);
kfree(call->filter);
call->filter = NULL;
destroy_preds(call);
return -ENOMEM;
}