linux-kernel - [PATCH v4 06/15] ring-buffer: Clear pages on error in ring_buffer_subbuf_order

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Message-ID: <20231215175544.955184798@goodmis.org>
Date: Fri, 15 Dec 2023 12:55:08 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Tzvetomir Stoyanov <tz.stoyanov@...il.com>,
 Vincent Donnefort <vdonnefort@...gle.com>,
 Kent Overstreet <kent.overstreet@...il.com>
Subject: [PATCH v4 06/15] ring-buffer: Clear pages on error in ring_buffer_subbuf_order_set()
 failure

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

On failure to allocate ring buffer pages, the pointer to the CPU buffer
pages is freed, but the pages that were allocated previously were not.
Make sure they are freed too.

Fixes: TBD ("tracing: Set new size of the ring buffer sub page")
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/ring_buffer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 57b9d3f5f32e..dd03887a4737 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -5860,6 +5860,7 @@ int ring_buffer_subbuf_order_set(struct trace_buffer *buffer, int order)
 	for_each_buffer_cpu(buffer, cpu) {
 		if (!cpu_buffers[cpu])
 			continue;
+		rb_free_cpu_buffer(cpu_buffers[cpu]);
 		kfree(cpu_buffers[cpu]);
 	}
 	kfree(cpu_buffers);
-- 
2.42.0