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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 2F24DC43460 for ; Thu, 29 Apr 2021 13:47:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F120B6143B for ; Thu, 29 Apr 2021 13:47:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239269AbhD2NsF (ORCPT ); Thu, 29 Apr 2021 09:48:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237712AbhD2Nr7 (ORCPT ); Thu, 29 Apr 2021 09:47:59 -0400 Received: from mail-wr1-x434.google.com (mail-wr1-x434.google.com [IPv6:2a00:1450:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 44507C06138F for ; Thu, 29 Apr 2021 06:47:12 -0700 (PDT) Received: by mail-wr1-x434.google.com with SMTP id m9so54289356wrx.3 for ; Thu, 29 Apr 2021 06:47:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=QdgOqG3N8NoAcJADfF2z8B9NTKycDIqg1ia12c/fZYc=; b=UM68g7XYs5/gTZCOix9BtmchrVRoD1W+BgHLFEdn+Bf0VCGZSDISCR92YwvXcpfT9x aRdyyRGPlnrZHZU8RICPPOWu9nMGeVObKXmwTRBEVt6ad5J/Mu09rNUtb7MAYof+IJ9s QST+TLqItfgbywCFCeyTuWufaYLmfFgA4mq/A= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=QdgOqG3N8NoAcJADfF2z8B9NTKycDIqg1ia12c/fZYc=; b=kuOQ/Bm/LoX0Y5VlH9MS3hzPQQCbSZVyZVlw/7K/GB2rnJF3xHj5kzBuN/NRYjTNuI YCjUy5qnRx6BYpESx1ZExSuEWlgrl8fr+vivVSIGP0SMCxMq0cpnfF3xhGZZ5UzWKkxg cGvUCHRhtq/dpOLlfHfL9SVb2Wl+ihhtfh9WuUSjK7yrB1ngKetLg0K4Ze3H7mLozjDL H3ULwNeYHLT8+qTKJ2KKf/7skEihl0q0o89VafyygTmzkouFOHQZVo2dFIDmn8hLPzfK IDM+w37yApbi2KDmGGGO+YNE9LZrjt85LfcS9xu+uhijBfRNPoyMiEN3IV5bL03ZMC/S d5xQ== X-Gm-Message-State: AOAM531Ld+xjcs8xxDu+7T2tLMwY1xi6iCgZlkP1JEOx8CBVNe5BJDVd UKf2/56gb6zMshRAXCYLzwyuLg== X-Google-Smtp-Source: ABdhPJzBNsKBTsNJidzrYzujh6W7/cmshdmEYtoyNxbD0YWX9LTkIAo6uG3NbjdcyeeRsISHpgeg8g== X-Received: by 2002:a5d:59a9:: with SMTP id p9mr3796298wrr.289.1619704031046; Thu, 29 Apr 2021 06:47:11 -0700 (PDT) Received: from localhost.localdomain (8.7.1.e.3.2.9.3.e.a.2.1.c.2.e.4.f.f.6.2.a.5.a.7.0.b.8.0.1.0.0.2.ip6.arpa. [2001:8b0:7a5a:26ff:4e2c:12ae:3923:e178]) by smtp.gmail.com with ESMTPSA id x8sm5105592wru.70.2021.04.29.06.47.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Apr 2021 06:47:10 -0700 (PDT) From: Lorenz Bauer To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: kernel-team@cloudflare.com, Lorenz Bauer , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next 2/3] bpf: verifier: use copy_array for jmp_history Date: Thu, 29 Apr 2021 14:46:55 +0100 Message-Id: <20210429134656.122225-3-lmb@cloudflare.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210429134656.122225-1-lmb@cloudflare.com> References: <20210429134656.122225-1-lmb@cloudflare.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Eliminate a couple needless kfree / kmalloc cycles by using copy_array for jmp_history. Signed-off-by: Lorenz Bauer --- kernel/bpf/verifier.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 67d914b26a39..2b9623ac9288 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -926,16 +926,13 @@ static int copy_verifier_state(struct bpf_verifier_state *dst_state, const struct bpf_verifier_state *src) { struct bpf_func_state *dst; - u32 jmp_sz = sizeof(struct bpf_idx_pair) * src->jmp_history_cnt; int i, err; - if (dst_state->jmp_history_cnt < src->jmp_history_cnt) { - kfree(dst_state->jmp_history); - dst_state->jmp_history = kmalloc(jmp_sz, GFP_USER); - if (!dst_state->jmp_history) - return -ENOMEM; - } - memcpy(dst_state->jmp_history, src->jmp_history, jmp_sz); + dst_state->jmp_history = copy_array(dst_state->jmp_history, src->jmp_history, + src->jmp_history_cnt, sizeof(struct bpf_idx_pair), + GFP_USER); + if (!dst_state->jmp_history) + return -ENOMEM; dst_state->jmp_history_cnt = src->jmp_history_cnt; /* if dst has more stack frames then src frame, free them */ -- 2.27.0