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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7BEFBC433EF for ; Tue, 15 Feb 2022 02:06:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230419AbiBOCGK (ORCPT ); Mon, 14 Feb 2022 21:06:10 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:49480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230498AbiBOCF7 (ORCPT ); Mon, 14 Feb 2022 21:05:59 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E8652246 for ; Mon, 14 Feb 2022 18:05:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1644890748; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=rcVCDBo5DVaghZVQQl2zbGTyQ7E+laKLLxGgEjqHxnk=; b=BsxIUDJ0NFwUiJ43PxEXU25y1vTuIzFDlJT36TVEeYsSeAjix370M3S14x+VeiVImZpYVh ybAaCpPtG7IAqjI2MIlyPAfEqj5tohTeDvfW1P383T/n32JInI3MLvmIx6m44mo3fpgB5S HGUF20Hn81Et1PA9gKO6PtJYyrlm8GU= Received: from mail-oo1-f69.google.com (mail-oo1-f69.google.com [209.85.161.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-20-FwxPgrQzM-2Owczkqe46SA-1; Mon, 14 Feb 2022 21:05:47 -0500 X-MC-Unique: FwxPgrQzM-2Owczkqe46SA-1 Received: by mail-oo1-f69.google.com with SMTP id v10-20020a4ade8a000000b003177422e81dso11707435oou.3 for ; Mon, 14 Feb 2022 18:05:47 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=rcVCDBo5DVaghZVQQl2zbGTyQ7E+laKLLxGgEjqHxnk=; b=ZUY+P9geHRG61LrfvO8WOHLoPuNyp+kUpqpF2GZSPpa8xnAdESLG5O3/JtK9lyMSgb KwinOFes0+9vkrsOfJhsAA7ctQ4/IDbZyZbisd+3z4MhpiXknklcCKzF3rWK8FH4PMKt 8YadA477VZ7NXCVGq+3cQC3ktVuJlXMJ7D2el2ZVqOcQvXzQxt3IbuD/JfXp7bOaOKU/ CliW8HWgoBatVfp/lzmaps02UMYb9pXgBMqu5Ynb2/GL5Cv5j5NZ3qyF8Ku+NccTtgr2 EFtabWQZb62gePaKTEkxRjwVuzv7CnKqANZUUKsxyWvbvdNrjz1x9r4D1Q06SoWutb3Q lBQQ== X-Gm-Message-State: AOAM533WWipJMStUKL3OUQ2WEUZ0G5pze7odcAdvdRDVw854vKc4nz3i 1a4j9o5tWV62CoIljJ76uunpo0NIB7l7UV67TzYbzUqKImXvNlRBhBNK5M4CjhM04cGWeinDrBv rVpiDym963r56tMoaEvLZpmaX X-Received: by 2002:a05:6830:4113:: with SMTP id w19mr688306ott.120.1644890746728; Mon, 14 Feb 2022 18:05:46 -0800 (PST) X-Google-Smtp-Source: ABdhPJzEs/cQG7EnoAYBz/PX072UhjyPsRpX8PJZ5Lr3Q9WSLBCh3TgTI0hgly/YAlr42AGrYmPADg== X-Received: by 2002:a05:6830:4113:: with SMTP id w19mr688302ott.120.1644890746552; Mon, 14 Feb 2022 18:05:46 -0800 (PST) Received: from localhost.localdomain.com (024-205-208-113.res.spectrum.com. [24.205.208.113]) by smtp.gmail.com with ESMTPSA id r41sm14527325oap.2.2022.02.14.18.05.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Feb 2022 18:05:46 -0800 (PST) From: trix@redhat.com To: jk@codeconstruct.com.au, matt@codeconstruct.com.au, davem@davemloft.net, kuba@kernel.org, nathan@kernel.org, ndesaulniers@google.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Tom Rix Subject: [PATCH v2] mctp: fix use after free Date: Mon, 14 Feb 2022 18:05:41 -0800 Message-Id: <20220215020541.2944949-1-trix@redhat.com> X-Mailer: git-send-email 2.26.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Rix Clang static analysis reports this problem route.c:425:4: warning: Use of memory after it is freed trace_mctp_key_acquire(key); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ When mctp_key_add() fails, key is freed but then is later used in trace_mctp_key_acquire(). Add an else statement to use the key only when mctp_key_add() is successful. Fixes: 4f9e1ba6de45 ("mctp: Add tracepoints for tag/key handling") Signed-off-by: Tom Rix --- v2: change the Fixes: line net/mctp/route.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/net/mctp/route.c b/net/mctp/route.c index 17e3482aa770..0c4c56e1bd6e 100644 --- a/net/mctp/route.c +++ b/net/mctp/route.c @@ -419,13 +419,14 @@ static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb) * this function. */ rc = mctp_key_add(key, msk); - if (rc) + if (rc) { kfree(key); + } else { + trace_mctp_key_acquire(key); - trace_mctp_key_acquire(key); - - /* we don't need to release key->lock on exit */ - mctp_key_unref(key); + /* we don't need to release key->lock on exit */ + mctp_key_unref(key); + } key = NULL; } else { -- 2.26.3