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=-15.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 9DA0EC76191 for ; Mon, 15 Jul 2019 14:39:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 68FDB205ED for ; Mon, 15 Jul 2019 14:39:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563201570; bh=SrSY2hd7sPAJZhLXte82PgIm2GFAWhZBwxpsNfBoDfQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=CZ7xQ2kpOuw5mZXa0FJvh9zgfr7qSCIS0dcMINaMBN6TlnhnydI+dbXUHoSqe+2Pk Nb0U8lw+ZxAtk4PT/Q/ladQpW6l4bJKBc5C5Qmu3yL6EmmLIwy7EUiSMq4v+X4L4a7 3qyoQb3f8E4aOa8kDPI6ZIjrd2UFXWBXqny2qpj4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404286AbfGOOj3 (ORCPT ); Mon, 15 Jul 2019 10:39:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:38402 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392101AbfGOOjM (ORCPT ); Mon, 15 Jul 2019 10:39:12 -0400 Received: from sasha-vm.mshome.net (unknown [73.61.17.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 332ED205ED; Mon, 15 Jul 2019 14:39:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563201551; bh=SrSY2hd7sPAJZhLXte82PgIm2GFAWhZBwxpsNfBoDfQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ALcZHaNkBeWmT8u09imiNWPnnpyHY2yFEzgU3CbFSO1c5Z5cRaeiQlW2+VXA5p3S9 SC1wLEJ4QzpHQwJVqWjFwt0bxqfWRmMyKHxIvJE+S+oZV3ZIB9t+T77NtuI4MonWyz hJkLJfM0RiEgxAG9yZcePu79Q+YDmdjzanDL7NTg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Arnaldo Carvalho de Melo , Leo Yan , Adrian Hunter , Jiri Olsa , Namhyung Kim , Sasha Levin Subject: [PATCH AUTOSEL 4.9 40/73] perf evsel: Make perf_evsel__name() accept a NULL argument Date: Mon, 15 Jul 2019 10:35:56 -0400 Message-Id: <20190715143629.10893-40-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190715143629.10893-1-sashal@kernel.org> References: <20190715143629.10893-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnaldo Carvalho de Melo [ 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 a62f79558146..758d0108c5a5 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -558,6 +558,9 @@ const char *perf_evsel__name(struct perf_evsel *evsel) { char bf[128]; + if (!evsel) + goto out_unknown; + if (evsel->name) return evsel->name; @@ -594,7 +597,10 @@ 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