tracing: Fix possible double free in event_enable_trigger_func()

There was a case that triggered a double free in event_trigger_callback()
due to the called reg() function freeing the trigger_data and then it
getting freed again by the error return by the caller. The solution there
was to up the trigger_data ref count.

Code inspection found that event_enable_trigger_func() has the same issue,
but is not as easy to trigger (requires harder to trigger failures). It
needs to be solved slightly different as it needs more to clean up when the
reg() function fails.

Link: http://lkml.kernel.org/r/20180725124008.7008e586@gandalf.local.home
Cc: stable@vger.kernel.org
Fixes: 7862ad1846e99 ("tracing: Add 'enable_event' and 'disable_event' event trigger commands")
Reivewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index d18ec0e58be2a33747fee0824ff3ac306c72967b..5dea177cef53120129c7d4a4d76eacb67ad66db0 100644 (file)
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -1420,6 +1420,9 @@ int event_enable_trigger_func(struct event_command *cmd_ops,
                goto out;
        }
 
+       /* Up the trigger_data count to make sure nothing frees it on failure */
+       event_trigger_init(trigger_ops, trigger_data);
+
        if (trigger) {
                number = strsep(&trigger, ":");
 
@@ -1470,6 +1473,7 @@ int event_enable_trigger_func(struct event_command *cmd_ops,
                goto out_disable;
        /* Just return zero, not the number of enabled functions */
        ret = 0;
+       event_trigger_free(trigger_ops, trigger_data);
  out:
        return ret;
 
@@ -1480,7 +1484,7 @@ int event_enable_trigger_func(struct event_command *cmd_ops,
  out_free:
        if (cmd_ops->set_filter)
                cmd_ops->set_filter(NULL, trigger_data, NULL);
-       kfree(trigger_data);
+       event_trigger_free(trigger_ops, trigger_data);
        kfree(enable_data);
        goto out;
 }