tree d34045c522b96a57bd2ca29c089cf6df8d9d6b6e
parent 3cec638b3d793b7cacdec5b8072364b41caeb0e1
author Steven Rostedt (VMware) <rostedt@goodmis.org> 1544504281 -0500
committer Steven Rostedt (VMware) <rostedt@goodmis.org> 1544554228 -0500

tracing: Fix memory leak of instance function hash filters

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>