Commit 2c9ee74a authored Apr 01, 2025 by Steven Rostedt Committed by Steven Rostedt (Google) Apr 02, 2025

tracing: Free module_delta on freeing of persistent ring buffer

If a persistent ring buffer is created, a "module_delta" array is also
allocated to hold the module deltas of loaded modules that match modules
in the scratch area. If this buffer gets freed, the module_delta array is
not freed and causes a memory leak.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250401124525.1f9ac02a@gandalf.local.home

Fixes: 35a380dd ("tracing: Show last module text symbols in the stacktrace")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

parent b81ff11c

kernel/trace/trace.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -9609,6 +9609,7 @@ static void free_trace_buffers(struct trace_array *tr)
		return;

		free_trace_buffer(&tr->array_buffer);
		kfree(tr->module_delta);

		#ifdef CONFIG_TRACER_MAX_TRACE
		free_trace_buffer(&tr->max_buffer);