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 B60C82F8EA2; Mon, 17 Aug 2026 14:01:39 +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=1786975304; cv=none; b=ZCSR5YyBj8h6+joRqLj/B+2JSIUfNKl5FMBWO/WUnnnE1dSJN1cV6uUOQv77LUk+fHwFqLigEL9crAG0dAybZxRtbO/MdNwXdAQ4jAckIrqqF0Kk7UqwGCbIZslyc+dXZGBNG0xQ804qyB/Wk3yvgcjt4WaEBzeS9gxiiOFJ7Vo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786975304; c=relaxed/simple; bh=ZBwhgAdCr14eVLcPkuPBB4no9aSvAh2syITSOGo5QFo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=L2fTPGYejem0LgQINEWsfV4IHLKaXPMo5qvxTbiSV0KYtRkf+fXVYqZG3h1QjifeSrgZdbER+TQif/jKbB70UrHxzcH2snulsC9S+hLwme1392QjWrnD7JeKn3Fxg2CSNYHjYVtLs34e6kK+mWuccSM1qCq0X4smfds1vZfysGA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0EeJSK+l; 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="0EeJSK+l" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D147F1F000E9; Mon, 17 Aug 2026 14:01:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786975299; bh=NOQVG7cR4x7yb804U7lvZPgwGkK8aTEH/lnq8hupRpA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=0EeJSK+ltS7wJA8JqdreMAFoggvYDAutyvgmCe3RKKs9SM0XbuXzmjDNsHlG+3DUU A0rPi0/7oP2tSlKDt++ImaK4J9c4Ccn84rEce4Ffg+yl3b8EGmGpShSlc8siD1qwg0 9eOztwogDzO13DFqk/euOGVZKwGVqVwDj5Sie+6U= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vincent Donnefort , Steven Rostedt Subject: [PATCH 6.18 230/250] ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer() Date: Mon, 17 Aug 2026 15:33:11 +0200 Message-ID: <20260817132545.897651315@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132536.466235697@linuxfoundation.org> References: <20260817132536.466235697@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 6.18-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 @@ -2361,6 +2361,7 @@ rb_allocate_cpu_buffer(struct trace_buff GFP_KERNEL, cpu_to_node(cpu)); if (!bpage) return NULL; + bpage->order = cpu_buffer->buffer->subbuf_order; rb_check_bpage(cpu_buffer, bpage);