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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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 0161CC4332F for ; Mon, 13 Sep 2021 14:34:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE31460FBF for ; Mon, 13 Sep 2021 14:34:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347543AbhIMOem (ORCPT ); Mon, 13 Sep 2021 10:34:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:51038 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346889AbhIMO3y (ORCPT ); Mon, 13 Sep 2021 10:29:54 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9E2AB61B7D; Mon, 13 Sep 2021 13:50:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631541051; bh=TVKnn333PQunDpQYQvNZzRndMa0VJJy06bQeM8/f4/I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S030UuWl3L3Ip+PxqGVjpF9pIrd492ExcHzDsaORSCdt74XOjTBQZmv5QDXZSFMPJ UkLS4QcWKukW1Y5PkcOTsy1Ul0pawAdY2hZGnPHSF2tZacFzyTvp1lvY0eNTQjQ2/U 6ff2wJlDrg0KirZWRt4IWSTCLN7SdbpfI8MYa7k4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Quentin Monnet , Andrii Nakryiko , Sasha Levin Subject: [PATCH 5.14 143/334] libbpf: Return non-null error on failures in libbpf_find_prog_btf_id() Date: Mon, 13 Sep 2021 15:13:17 +0200 Message-Id: <20210913131118.190310648@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913131113.390368911@linuxfoundation.org> References: <20210913131113.390368911@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Quentin Monnet [ Upstream commit 6d2d73cdd673d493f9f3751188757129b1d23fb7 ] Variable "err" is initialised to -EINVAL so that this error code is returned when something goes wrong in libbpf_find_prog_btf_id(). However, a recent change in the function made use of the variable in such a way that it is set to 0 if retrieving linear information on the program is successful, and this 0 value remains if we error out on failures at later stages. Let's fix this by setting err to -EINVAL later in the function. Fixes: e9fc3ce99b34 ("libbpf: Streamline error reporting for high-level APIs") Signed-off-by: Quentin Monnet Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20210729162028.29512-2-quentin@isovalent.com Signed-off-by: Sasha Levin --- tools/lib/bpf/libbpf.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index aa5ad6fc5f40..2234d5c33177 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -9515,7 +9515,7 @@ static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd) struct bpf_prog_info_linear *info_linear; struct bpf_prog_info *info; struct btf *btf = NULL; - int err = -EINVAL; + int err; info_linear = bpf_program__get_prog_info_linear(attach_prog_fd, 0); err = libbpf_get_error(info_linear); @@ -9524,6 +9524,8 @@ static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd) attach_prog_fd); return err; } + + err = -EINVAL; info = &info_linear->info; if (!info->btf_id) { pr_warn("The target program doesn't have BTF\n"); -- 2.30.2