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=-14.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 12181C41514 for ; Wed, 24 Jul 2019 20:06:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD5C8206BA for ; Wed, 24 Jul 2019 20:06:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563998771; bh=qJQ9MdWWEcEJ8wHvcnyUSW8VtppiD40F5u1xLzG7IXk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=c8Gt1b/3LJ6yNGZ2YQYIWkXI6P4STWX59yLHCn9LGRoIQa5S3//rc5CjuqxIgjp2C VlpPXPRLXVMDvv+pGwWbzZ2GX5b1N+KfbLYIVioZSU883Ra3Xk9eTyyaqmwxnJOXvZ ABCLIMk86nGwlG/OwKpsjR25phiEI7wARaBmpk/s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388781AbfGXUGK (ORCPT ); Wed, 24 Jul 2019 16:06:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:57364 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392724AbfGXUFk (ORCPT ); Wed, 24 Jul 2019 16:05:40 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 5ADFE21849; Wed, 24 Jul 2019 20:05:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563998739; bh=qJQ9MdWWEcEJ8wHvcnyUSW8VtppiD40F5u1xLzG7IXk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YRugYXUV1ybsgJEF8tFJqPcATx1g5gtC88bFswmqQq0C3xXVE+6QrL0p/efTVXZgV sgL0cs4IZRxIbHRwSilT+VopFBB/SnjRjq224JHBb/sor9ifki+CaBovwHdfJo10Zy axGD6sKJEAvgpN9QFjMhUdz4QmdRUzndQJtSU6ww= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Leo Yan , Adrian Hunter , Jiri Olsa , Namhyung Kim , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH 4.19 080/271] perf evsel: Make perf_evsel__name() accept a NULL argument Date: Wed, 24 Jul 2019 21:19:09 +0200 Message-Id: <20190724191702.034626006@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190724191655.268628197@linuxfoundation.org> References: <20190724191655.268628197@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit fdbdd7e8580eac9bdafa532746c865644d125e34 ] In which case it simply returns "unknown", like when it can't figure out the evsel->name value. This makes this code more robust and fixes a problem in 'perf trace' where a NULL evsel was being passed to a routine that only used the evsel for printing its name when a invalid syscall id was passed. Reported-by: Leo Yan Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-f30ztaasku3z935cn3ak3h53@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/evsel.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index b65ad5a273eb..4fad92213609 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -590,6 +590,9 @@ const char *perf_evsel__name(struct perf_evsel *evsel) { char bf[128]; + if (!evsel) + goto out_unknown; + if (evsel->name) return evsel->name; @@ -626,7 +629,10 @@ const char *perf_evsel__name(struct perf_evsel *evsel) evsel->name = strdup(bf); - return evsel->name ?: "unknown"; + if (evsel->name) + return evsel->name; +out_unknown: + return "unknown"; } const char *perf_evsel__group_name(struct perf_evsel *evsel) -- 2.20.1