Message ID | 20200401141634.18780-3-benjamin.romer@canonical.com |
---|---|
State | New |
Headers | show |
Series | CVE-2019-19768 | expand |
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 746f52de0661..42c39a76aa56 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1779,8 +1779,11 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, } ret = 0; - if (bt == NULL) + if (bt == NULL) { ret = blk_trace_setup_queue(q, bdev); + bt = rcu_dereference_protected(q->blk_trace, + lockdep_is_held(&q->blk_trace_mutex)); + } if (ret == 0) { if (attr == &dev_attr_act_mask)