From: David Carlier <devnexen@gmail.com>
To: rostedt@goodmis.org, mhiramat@kernel.org
Cc: mathieu.desnoyers@efficios.com,
linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org,
David Carlier <devnexen@gmail.com>
Subject: [PATCH v2 0/2] tracing: Fix buffer_meta open paths
Date: Mon, 14 Sep 2026 14:35:03 +0100 [thread overview]
Message-ID: <20260914133506.4865-1-devnexen@gmail.com> (raw)
Two fixes for per_cpu/cpuN/buffer_meta open. The first drops the
trace_array reference under trace_types_lock on the error path. The
second fails the open for CPUs that never came online, which would
otherwise dereference a NULL cpu_buffer on read. With the second patch,
that error path becomes reachable in practice.
Changes since v1:
- Add patch 2 for the NULL dereference Sashiko reported on v1.
v1: https://lore.kernel.org/all/20260913133829.15307-1-devnexen@gmail.com/
David Carlier (2):
tracing: Take trace_types_lock when dropping the buffer_meta reference
ring-buffer: Do not show buffer_meta for CPUs without a buffer
kernel/trace/ring_buffer.c | 3 +++
kernel/trace/trace.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)
--
2.55.0
next reply other threads:[~2026-09-14 13:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-14 13:35 David Carlier [this message]
2026-09-14 13:35 ` [PATCH v2 1/2] tracing: Take trace_types_lock when dropping the buffer_meta reference David Carlier
2026-09-14 13:35 ` [PATCH v2 2/2] ring-buffer: Do not show buffer_meta for CPUs without a buffer David Carlier
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