From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D572BC64E90 for ; Tue, 17 Nov 2020 13:43:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8EC33206A5 for ; Tue, 17 Nov 2020 13:43:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Y/RPhNVf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387493AbgKQNm4 (ORCPT ); Tue, 17 Nov 2020 08:42:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:55316 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387465AbgKQNmp (ORCPT ); Tue, 17 Nov 2020 08:42:45 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 122B72468D; Tue, 17 Nov 2020 13:42:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1605620563; bh=TW0kadzJVG5/0T+RUDy7xRV2L7Vy902zfmm/D1KQlZw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y/RPhNVf9xhXVKV4oP6dHtjGDokjhioydIITHhSuD2VnORRlqb0pvw0uZpwl0IXkJ IagHh2Zoz7IXiJOXxPm8CVgaMSFdeg/mcDAMckjRTZmavNowSXxBMS9cbLphUQ6OSD G2JLDHdtDqni5zcMIb5wjmlgpnKVk1IpkucYbQjA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mike Leach , Mathieu Poirier Subject: [PATCH 5.9 254/255] coresight: Fix uninitialised pointer bug in etm_setup_aux() Date: Tue, 17 Nov 2020 14:06:34 +0100 Message-Id: <20201117122151.294783768@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201117122138.925150709@linuxfoundation.org> References: <20201117122138.925150709@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mike Leach commit 39a7661dcf655c8198fd5d72412f5030a8e58444 upstream. Commit [bb1860efc817] changed the sink handling code introducing an uninitialised pointer bug. This results in the default sink selection failing. Prior to commit: static void etm_setup_aux(...) struct coresight_device *sink; /* First get the selected sink from user space. */ if (event->attr.config2) { id = (u32)event->attr.config2; sink = coresight_get_sink_by_id(id); } else { sink = coresight_get_enabled_sink(true); } *sink always initialised - possibly to NULL which triggers the automatic sink selection. After commit: static void etm_setup_aux(...) struct coresight_device *sink; /* First get the selected sink from user space. */ if (event->attr.config2) { id = (u32)event->attr.config2; sink = coresight_get_sink_by_id(id); } *sink pointer uninitialised when not providing a sink on the perf command line. This breaks later checks to enable automatic sink selection. Fixes: bb1860efc817 ("coresight: etm: perf: Sink selection using sysfs is deprecated") Signed-off-by: Mike Leach Signed-off-by: Mathieu Poirier Link: https://lore.kernel.org/r/20201029164559.1268531-3-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-etm-perf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -210,7 +210,7 @@ static void *etm_setup_aux(struct perf_e u32 id; int cpu = event->cpu; cpumask_t *mask; - struct coresight_device *sink; + struct coresight_device *sink = NULL; struct etm_event_data *event_data = NULL; event_data = alloc_event_data(cpu);