From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 721AF43BDD2; Mon, 17 Aug 2026 13:50:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786974623; cv=none; b=EUloUkEQLSmibnzvNLnNH6Q2qeZsWv/zRO4Vm3AkKdZ8d+3ZIoliUn2XG9PSePIKUaRh1QvKQMUkCZTduV1WYCsNx/4LUarQ/QcdJjkSAky0gRY7KlgqkhQayRw1mMF1YItSomxn6T9vEO2YZwWphWnEtG/rngu+lKHHOBxMlZs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786974623; c=relaxed/simple; bh=HWTfLZob+P/gqJTLH147eBGNY+2I5vI9a6k6HKyn77Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nDOGDk8v1v70u37ttL5oHUERNFYhVQtWIaKQimKYYmxdME9L0jq7bui3+hn/rjN3Su+W7Lp3o5CF/HYDbvw0VZ8tbUpCuMB4YJHBDmhko+oXqAFgw+BXRMXeJ0K0UcUC19Qscewva4q/S6Ilie1vU2yHYliixmKO6QFGJTlwl7w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=KFK8sYz7; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="KFK8sYz7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DBD431F00A3E; Mon, 17 Aug 2026 13:50:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786974617; bh=oUX4CnRCy7jZfua4dNpgsuy+6e8C1Tqn4yuaaSeiyZw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=KFK8sYz7TP5KVFWpI9KrCSkLOlvDBk7BHxOyOOUtMpjyn3u6U65OLdrDXKVAKt0/y Mjx8PLCtqQOfJqXMvqZiRQT4ESim4rDeLkaB16XwUztqlbeiN3kg8tTsZDw5oKDVbG Dmj87ygCWSLz4NTd3xhTXF958n2N1HA9I5uqJzQk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vincent Donnefort , Steven Rostedt Subject: [PATCH 7.1 250/271] ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer() Date: Mon, 17 Aug 2026 15:32:55 +0200 Message-ID: <20260817132547.030688352@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132536.752504388@linuxfoundation.org> References: <20260817132536.752504388@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vincent Donnefort commit 6d014e44b68ddd43f71288d2a4dbb1a259869149 upstream. In rb_allocate_cpu_buffer(), bpage->order was omitted, leaving it as 0. This is an issue for a ring-buffer with subbufs bigger than PAGE_SIZE if when freed: free_buffer_page() relies on this value. Align the value with the actual allocation size (buffer::subbuf_order). Cc: stable@vger.kernel.org Fixes: f9b94daa542a ("ring-buffer: Set new size of the ring buffer sub page") Link: https://patch.msgid.link/20260806211306.3704194-4-vdonnefort@google.com Signed-off-by: Vincent Donnefort Signed-off-by: Steven Rostedt Signed-off-by: Greg Kroah-Hartman --- kernel/trace/ring_buffer.c | 1 + 1 file changed, 1 insertion(+) --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2400,6 +2400,7 @@ rb_allocate_cpu_buffer(struct trace_buff bpage = alloc_cpu_page(cpu); if (!bpage) return NULL; + bpage->order = cpu_buffer->buffer->subbuf_order; rb_check_bpage(cpu_buffer, bpage);