From patchwork Mon Jul 29 19:22:38 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 11064421 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5074314DB for ; Mon, 29 Jul 2019 19:44:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 422B2284F5 for ; Mon, 29 Jul 2019 19:44:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 355BF285EB; Mon, 29 Jul 2019 19:44:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 130A6285C3 for ; Mon, 29 Jul 2019 19:44:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=+YZ9/NCk6iuy/04qVcPi8DAf1554wx3XHzq0gQMf49U=; b=Q0AlKXEq0uloXa JOG+y8z/yO7dSAuA14PPKEXZv3+khIJ5pr4B9qyspM3kKTdQqbDK4ScqfP3GUVLkVQVhvXP7tCmA0 Vmn6yvP946V2OafjMt3pRGBMhNDcgaRVuhdUOTbFMKeAf5AE10rFuoU+0bORkPo2w3/m2Ao9Rnu3i pOVB/Rd4ve/caXksgjBIuPI78C5kHCNbkAHqjbGV+3Px/rs8RvVYfX0K0fniLlGFa3GcrojKkv5UV T39Nqvk96VSnSuyDQ1qDIvwmXJFleiWgyggLYOja5bO0RRvNOlUF4e+zBj3rCZkMxEL/DjyNDF2CR ZbhUtn0qHv1Sg5dD+Few==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hsBYw-0007cT-2V; Mon, 29 Jul 2019 19:44:02 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hsBXd-0006gB-2e for linux-arm-kernel@lists.infradead.org; Mon, 29 Jul 2019 19:42:43 +0000 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 4D920217F5; Mon, 29 Jul 2019 19:42:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564429360; bh=PC1jyJSYs8kQGazeAblx2dFnoYd09Pwf5CS25k/MkAY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0AxitwQsiE4X/Hky0vsCd+z4OZKGnaknPMUvIQO6ybI0R9LjfIo+mn9Q/jsCEofuv oYsvoHFtMVRu6DqXP607AQR2MNG4UquaZtHh8IaYsI2HEUFhKkITa9gRBKD12JiwTI 7uK2GgMmrMiVchmDwFMKM3MWYVs9i8RnoRAYWORo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Subject: [PATCH 4.19 071/113] perf annotate: Fix dereferencing freed memory found by the smatch tool Date: Mon, 29 Jul 2019 21:22:38 +0200 Message-Id: <20190729190712.439276151@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190729190655.455345569@linuxfoundation.org> References: <20190729190655.455345569@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190729_124241_458766_CC9F426F X-CRM114-Status: GOOD ( 13.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Song Liu , Konstantin Khlebnikov , Rasmus Villemoes , Jin Yao , Sasha Levin , Andi Kleen , Alexey Budankov , Alexander Shishkin , Suzuki Poulouse , Arnaldo Carvalho de Melo , Alexios Zavras , Davidlohr Bueso , Namhyung Kim , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Mathieu Poirier , Greg Kroah-Hartman , Thomas Richter , Adrian Hunter , stable@vger.kernel.org, "David S. Miller" , Changbin Du , Peter Zijlstra , Jiri Olsa , Leo Yan , Eric Saint-Etienne Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP [ Upstream commit 600c787dbf6521d8d07ee717ab7606d5070103ea ] Based on the following report from Smatch, fix the potential dereferencing freed memory check. tools/perf/util/annotate.c:1125 disasm_line__parse() error: dereferencing freed memory 'namep' tools/perf/util/annotate.c 1100 static int disasm_line__parse(char *line, const char **namep, char **rawp) 1101 { 1102 char tmp, *name = ltrim(line); [...] 1114 *namep = strdup(name); 1115 1116 if (*namep == NULL) 1117 goto out_free_name; [...] 1124 out_free_name: 1125 free((void *)namep); ^^^^^ 1126 *namep = NULL; ^^^^^^ 1127 return -1; 1128 } If strdup() fails to allocate memory space for *namep, we don't need to free memory with pointer 'namep', which is resident in data structure disasm_line::ins::name; and *namep is NULL pointer for this failure, so it's pointless to assign NULL to *namep again. Committer note: Freeing namep, which is the address of the first entry of the 'struct ins' that is the first member of struct disasm_line would in fact free that disasm_line instance, if it was allocated via malloc/calloc, which, later, would a dereference of freed memory. 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/20190702103420.27540-5-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/annotate.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c index c357051dd2b6..daea1fdf7385 100644 --- a/tools/perf/util/annotate.c +++ b/tools/perf/util/annotate.c @@ -1079,16 +1079,14 @@ static int disasm_line__parse(char *line, const char **namep, char **rawp) *namep = strdup(name); if (*namep == NULL) - goto out_free_name; + goto out; (*rawp)[0] = tmp; *rawp = ltrim(*rawp); return 0; -out_free_name: - free((void *)namep); - *namep = NULL; +out: return -1; }