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tracing: Fix use-after-free in hist_register_trigger() 

This fixes a use-after-free case flagged by KASAN; make sure the test
happens before the potential free in this case.

Link: http://lkml.kernel.org/r/48fd74ab61bebd7dca9714386bb47d7c5ccd6a7b.1467247517.git.tom.zanussi@linux.intel.com

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2016-06-29 19:56:00 -05:00 committed by Steven Rostedt
parent 47c1856971
commit 7522c03ae3
1 changed files with 3 additions and 3 deletions
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6
kernel/trace/trace_events_hist.c
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@ -1441,6 +1441,9 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
goto out;
}
if (hist_data->attrs->pause)
data->paused = true;
if (named_data) {
destroy_hist_data(data->private_data);
data->private_data = named_data->private_data;
@ -1448,9 +1451,6 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
data->ops = &event_hist_trigger_named_ops;
}
if (hist_data->attrs->pause)
data->paused = true;
if (data->ops->init) {
ret = data->ops->init(data->ops, data);
if (ret < 0)