4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Steven Rostedt (VMware) rostedt@goodmis.org
commit 2840f84f74035e5a535959d5f17269c69fa6edc5 upstream.
The following commands will cause a memory leak:
# cd /sys/kernel/tracing # mkdir instances/foo # echo schedule > instance/foo/set_ftrace_filter # rmdir instances/foo
The reason is that the hashes that hold the filters to set_ftrace_filter and set_ftrace_notrace are not freed if they contain any data on the instance and the instance is removed.
Found by kmemleak detector.
Cc: stable@vger.kernel.org Fixes: 591dffdade9f ("ftrace: Allow for function tracing instance to filter functions") Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- kernel/trace/ftrace.c | 1 + 1 file changed, 1 insertion(+)
--- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -4836,6 +4836,7 @@ void ftrace_destroy_filter_files(struct if (ops->flags & FTRACE_OPS_FL_ENABLED) ftrace_shutdown(ops, 0); ops->flags |= FTRACE_OPS_FL_DELETED; + ftrace_free_filter(ops); mutex_unlock(&ftrace_lock); }