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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 F160BC76188 for ; Fri, 19 Jul 2019 04:29:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CABA42082E for ; Fri, 19 Jul 2019 04:29:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563510552; bh=uVOmfcGqr9MtGJMPPvp0QPQzFti5byiwdK2D7EFkMxY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=OS25YAGlF0UczsjEIegecKK7csVW1kHJIstLlE0+fSRGFZGdV7N7g9Lt+XSTz7Z8M giZNhgkmmhStgKCiscpti1aoPS2J6qrS1gzubvt1Sotx2Lz3E2BGjSFNYbuFPXJhDx w+WMnn4jxYCy+v4GhdaXtU6EqAFcIwjETx7D/uH0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731851AbfGSEFx (ORCPT ); Fri, 19 Jul 2019 00:05:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:38592 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728765AbfGSEFw (ORCPT ); Fri, 19 Jul 2019 00:05:52 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (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 AE1F0218BC; Fri, 19 Jul 2019 04:05:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509152; bh=uVOmfcGqr9MtGJMPPvp0QPQzFti5byiwdK2D7EFkMxY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Abuj0Z5Svq0paMwdVE/4okaZBzIJnrcQzSkRUG/+5nLbM9wfkHSMmLI6ENc3FsLSJ FR/oUL9if+GnzxAjI6/bpP/drO3shRidTBNjgvbZEk0MU91MJnaW9/PBPodO/QU7M1 7n9f3dsYCXTmf+2Hua4xuzLUll3vg3r/KBlNYR9g= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Leo Yan , Jiri Olsa , Adrian Hunter , Alexander Shishkin , Alexey Budankov , Alexios Zavras , Andi Kleen , Changbin Du , "David S . Miller" , Davidlohr Bueso , Eric Saint-Etienne , Jin Yao , Konstantin Khlebnikov , Mathieu Poirier , Namhyung Kim , Peter Zijlstra , Rasmus Villemoes , Song Liu , Suzuki Poulouse , Thomas Gleixner , Thomas Richter , linux-arm-kernel@lists.infradead.org, Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH AUTOSEL 5.1 098/141] perf top: Fix potential NULL pointer dereference detected by the smatch tool Date: Fri, 19 Jul 2019 00:02:03 -0400 Message-Id: <20190719040246.15945-98-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719040246.15945-1-sashal@kernel.org> References: <20190719040246.15945-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Leo Yan [ Upstream commit 111442cfc8abdeaa7ec1407f07ef7b3e5f76654e ] Based on the following report from Smatch, fix the potential NULL pointer dereference check. tools/perf/builtin-top.c:109 perf_top__parse_source() warn: variable dereferenced before check 'he' (see line 103) tools/perf/builtin-top.c:233 perf_top__show_details() warn: variable dereferenced before check 'he' (see line 228) tools/perf/builtin-top.c 101 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he) 102 { 103 struct perf_evsel *evsel = hists_to_evsel(he->hists); ^^^^ 104 struct symbol *sym; 105 struct annotation *notes; 106 struct map *map; 107 int err = -1; 108 109 if (!he || !he->ms.sym) 110 return -1; This patch moves the values assignment after validating pointer 'he'. Signed-off-by: Leo Yan Acked-by: Jiri Olsa Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Alexey Budankov Cc: Alexios Zavras Cc: Andi Kleen Cc: Changbin Du Cc: David S. Miller Cc: Davidlohr Bueso Cc: Eric Saint-Etienne Cc: Jin Yao Cc: Konstantin Khlebnikov Cc: Mathieu Poirier Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Rasmus Villemoes Cc: Song Liu Cc: Suzuki Poulouse Cc: Thomas Gleixner Cc: Thomas Richter Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20190702103420.27540-4-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/builtin-top.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index fbbb0da43abb..42e3a4d07b18 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -101,7 +101,7 @@ static void perf_top__resize(struct perf_top *top) static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he) { - struct perf_evsel *evsel = hists_to_evsel(he->hists); + struct perf_evsel *evsel; struct symbol *sym; struct annotation *notes; struct map *map; @@ -110,6 +110,8 @@ static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he) if (!he || !he->ms.sym) return -1; + evsel = hists_to_evsel(he->hists); + sym = he->ms.sym; map = he->ms.map; @@ -226,7 +228,7 @@ static void perf_top__record_precise_ip(struct perf_top *top, static void perf_top__show_details(struct perf_top *top) { struct hist_entry *he = top->sym_filter_entry; - struct perf_evsel *evsel = hists_to_evsel(he->hists); + struct perf_evsel *evsel; struct annotation *notes; struct symbol *symbol; int more; @@ -234,6 +236,8 @@ static void perf_top__show_details(struct perf_top *top) if (!he) return; + evsel = hists_to_evsel(he->hists); + symbol = he->ms.sym; notes = symbol__annotation(symbol); -- 2.20.1