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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 ECCB4C3A5A9 for ; Wed, 4 Sep 2019 18:12:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BA4D5208E4 for ; Wed, 4 Sep 2019 18:12:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567620739; bh=DY4pztnOnG55fll5TNj3UuR3nsDwFvM6cxZfKneEtnU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=fgmG6bOzl4qtKmSHb2PrO4dCeVHZ5uyYu/bkQ5oHMPI249O4WDUH7GWazN4DU/qBv XzTtAj87KBsVCCxvS6H89aIgSc1LPoWhNgaILuXYo57iQQfBh0GiPpp1RqvPsZK9Y3 6UZZocgISK10owdVc8ZCfyA4rvgjPJw4z0WeMEtE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390070AbfIDSMT (ORCPT ); Wed, 4 Sep 2019 14:12:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:56612 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389518AbfIDSMR (ORCPT ); Wed, 4 Sep 2019 14:12:17 -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 492052087E; Wed, 4 Sep 2019 18:12:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567620736; bh=DY4pztnOnG55fll5TNj3UuR3nsDwFvM6cxZfKneEtnU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rGPIEYxcHh8z10yWDl+iPe6GPeRmd1wdPOWVYNfcyEdqlUsMliRh4+lhmM/e1fYu3 9jcc0BIfGftFIVF1DRbbnLqTdEGD5SB7LNlw61Zm9j4QNNlSF4j+5qBR06bDtqEQJF hKo3vusKgLbWxK+Qdb6NbWS6fp++Zb1hiA2ZCPMA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Naveen N. Rao" , "Steven Rostedt (VMware)" Subject: [PATCH 5.2 076/143] ftrace: Check for successful allocation of hash Date: Wed, 4 Sep 2019 19:53:39 +0200 Message-Id: <20190904175317.028334513@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190904175314.206239922@linuxfoundation.org> References: <20190904175314.206239922@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Naveen N. Rao commit 5b0022dd32b7c2e15edf1827ba80aa1407edf9ff upstream. In register_ftrace_function_probe(), we are not checking the return value of alloc_and_copy_ftrace_hash(). The subsequent call to ftrace_match_records() may end up dereferencing the same. Add a check to ensure this doesn't happen. Link: http://lkml.kernel.org/r/26e92574f25ad23e7cafa3cf5f7a819de1832cbe.1562249521.git.naveen.n.rao@linux.vnet.ibm.com Cc: stable@vger.kernel.org Fixes: 1ec3a81a0cf42 ("ftrace: Have each function probe use its own ftrace_ops") Signed-off-by: Naveen N. Rao Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Greg Kroah-Hartman --- kernel/trace/ftrace.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -4330,6 +4330,11 @@ register_ftrace_function_probe(char *glo old_hash = *orig_hash; hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, old_hash); + if (!hash) { + ret = -ENOMEM; + goto out; + } + ret = ftrace_match_records(hash, glob, strlen(glob)); /* Nothing found? */