Steven Rostedt (VMware) 649b988b12 ftrace: Do not hold references of ftrace_graph_{notrace_}hash out of graph_lock
The hashs ftrace_graph_hash and ftrace_graph_notrace_hash are modified
within the graph_lock being held. Holding a pointer to them and passing them
along can lead to a use of a stale pointer (fgd->hash). Move assigning the
pointer and its use to within the holding of the lock. Note, it's an
rcu_sched protected data, and other instances of referencing them are done
with preemption disabled. But the file manipuation code must be protected by
the lock.

The fgd->hash pointer is set to NULL when the lock is being released.

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2017-02-03 10:59:42 -05:00
..
2016-10-28 08:48:16 -06:00
2016-11-14 16:42:58 -05:00
2016-12-15 13:49:34 -08:00