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Subject[PATCH 4.17 19/67] tracing/kprobe: Release kprobe print_fmt properly
Date
4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jiri Olsa <jolsa@kernel.org>

commit 0fc8c3581dd42bc8f530314ca86db2d861485731 upstream.

We don't release tk->tp.call.print_fmt when destroying
local uprobe. Also there's missing print_fmt kfree in
create_local_trace_kprobe error path.

Link: http://lkml.kernel.org/r/20180709141906.2390-1-jolsa@kernel.org

Cc: stable@vger.kernel.org
Fixes: e12f03d7031a ("perf/core: Implement the 'perf_kprobe' PMU")
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
kernel/trace/trace_kprobe.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1451,8 +1451,10 @@ create_local_trace_kprobe(char *func, vo
}

ret = __register_trace_kprobe(tk);
- if (ret < 0)
+ if (ret < 0) {
+ kfree(tk->tp.call.print_fmt);
goto error;
+ }

return &tk->tp.call;
error:
@@ -1472,6 +1474,8 @@ void destroy_local_trace_kprobe(struct t
}

__unregister_trace_kprobe(tk);
+
+ kfree(tk->tp.call.print_fmt);
free_trace_kprobe(tk);
}
#endif /* CONFIG_PERF_EVENTS */

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