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tracing: Fix memory leak in set_trigger_filter() 

When create_event_filter() fails in set_trigger_filter(), the filter may
still be allocated and needs to be freed. The caller expects the
data->filter to be updated with the new filter, even if the new filter
failed (we could add an error message by setting set_str parameter of
create_event_filter(), but that's another update).

But because the error would just exit, filter was left hanging and
nothing could free it.

Found by kmemleak detector.

Cc: stable@vger.kernel.org
Fixes: bac5fb97a1 ("tracing: Add and use generic set_trigger_filter() implementation")
Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2018-12-09 21:17:30 -05:00
parent b61c19209c
commit 3cec638b3d
1 changed files with 4 additions and 2 deletions
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6
kernel/trace/trace_events_trigger.c
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@ -732,8 +732,10 @@ int set_trigger_filter(char *filter_str,
/* The filter is for the 'trigger' event, not the triggered event */
ret = create_event_filter(file->event_call, filter_str, false, &filter);
if (ret)
goto out;
/*
* If create_event_filter() fails, filter still needs to be freed.
* Which the calling code will do with data->filter.
*/
assign:
tmp = rcu_access_pointer(data->filter);