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 93386C76195 for ; Fri, 19 Jul 2019 04:01:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D8A4218B8 for ; Fri, 19 Jul 2019 04:01:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563508874; bh=DFafnbAHopfkugyR/u2EBGYtfhirSvbWGoa3dRt0uaQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=UNbwxvZQPdibhNSkae2kWZ3Eq8Ucxv7pInvovBGeEzYn6kH1D9OxjZQ69XRrHMzKj +dk9qWeNYBt45WRH5MD3mP36UPG9WAdgQkq+NAF3F72EalD4a2hsp1Rgjvt5dpDYV6 4u3S0BOgsS5S2nQoFmf4fNlW7VO14X3hMdtqF0PM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729360AbfGSEBM (ORCPT ); Fri, 19 Jul 2019 00:01:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:32796 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729317AbfGSEBH (ORCPT ); Fri, 19 Jul 2019 00:01:07 -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 AA3AB218BA; Fri, 19 Jul 2019 04:01:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563508866; bh=DFafnbAHopfkugyR/u2EBGYtfhirSvbWGoa3dRt0uaQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gz6+rTugbr1rNkKcKRCTMm8M5FYcrGPBQY0x3zX7kHzpj796ssfuh96kvF4Z3lZsa L3j74SKhGFm49IS3l50DSjlEia7G3RaCi/iLmjP0PVlgxXpWgfA8kU/o+D3fhwZJfJ vjaxOf5Gjad/BdghK2z/6FRynE+dfwS5b6pRnvJ4= 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 5.2 128/171] perf map: Fix potential NULL pointer dereference found by smatch tool Date: Thu, 18 Jul 2019 23:55:59 -0400 Message-Id: <20190719035643.14300-128-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719035643.14300-1-sashal@kernel.org> References: <20190719035643.14300-1-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: Leo Yan [ Upstream commit 363bbaef63ffebcc745239fe80a953ebb5ac9ec9 ] Based on the following report from Smatch, fix the potential NULL pointer dereference check. tools/perf/util/map.c:479 map__fprintf_srccode() error: we previously assumed 'state' could be null (see line 466) tools/perf/util/map.c 465 /* Avoid redundant printing */ 466 if (state && 467 state->srcfile && 468 !strcmp(state->srcfile, srcfile) && 469 state->line == line) { 470 free(srcfile); 471 return 0; 472 } 473 474 srccode = find_sourceline(srcfile, line, &len); 475 if (!srccode) 476 goto out_free_line; 477 478 ret = fprintf(fp, "|%-8d %.*s", line, len, srccode); 479 state->srcfile = srcfile; ^^^^^^^ 480 state->line = line; ^^^^^^^ This patch validates 'state' pointer before access its elements. 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 Fixes: dd2e18e9ac20 ("perf tools: Support 'srccode' output") Link: http://lkml.kernel.org/r/20190702103420.27540-8-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/map.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c index ee71efb9db62..9c81ee092784 100644 --- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -470,8 +470,11 @@ int map__fprintf_srccode(struct map *map, u64 addr, goto out_free_line; ret = fprintf(fp, "|%-8d %.*s", line, len, srccode); - state->srcfile = srcfile; - state->line = line; + + if (state) { + state->srcfile = srcfile; + state->line = line; + } return ret; out_free_line: -- 2.20.1