From patchwork Fri May 1 13:23:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 226564 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, 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 2DDD2C4724C for ; Fri, 1 May 2020 13:50:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 07E9D2051A for ; Fri, 1 May 2020 13:50:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588341048; bh=JEfPVeCIXS2ihp4wiKoaxqcfVeN9Aopia2uXZyuMbzs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kLF496a8+HJwkl9ZM5iFlrCfhhqJu+57jSxay5o+/SrStAkyM9q76d6Jxq2XHElGe ciDThvdUv1VDE/htOBtAqowsLlLN9gD3PVvQgNfjPbHKmWvvwsfZssdjsr7zwmvF9+ 38JyoMG36tZkXJDm4JuPW8B/ViZV2j/dzNWshGrA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731322AbgEANuo (ORCPT ); Fri, 1 May 2020 09:50:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:39368 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729339AbgEANjg (ORCPT ); Fri, 1 May 2020 09:39:36 -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 C34DB20757; Fri, 1 May 2020 13:39:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588340376; bh=JEfPVeCIXS2ihp4wiKoaxqcfVeN9Aopia2uXZyuMbzs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S2sGXyFNmNM4fTIMGSsCDevmR2WfFS6hjWgxmnaBXqypLef57yjTY5Tcwoov0QTZx qV2RZXZ+L4y617cPoImMtvrOMJXCCE71+lWGKSryKkcimmmW/bsiihG5cpKsO4f9Ra 2dpEe51tAD3b+VWOX/OcvuLhkLN/0vUwEZfOkQho= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jeremy Cline , Daniel Borkmann , Andrii Nakryiko , Sasha Levin Subject: [PATCH 5.4 53/83] libbpf: Initialize *nl_pid so gcc 10 is happy Date: Fri, 1 May 2020 15:23:32 +0200 Message-Id: <20200501131538.906016002@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200501131524.004332640@linuxfoundation.org> References: <20200501131524.004332640@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jeremy Cline [ Upstream commit 4734b0fefbbf98f8c119eb8344efa19dac82cd2c ] Builds of Fedora's kernel-tools package started to fail with "may be used uninitialized" warnings for nl_pid in bpf_set_link_xdp_fd() and bpf_get_link_xdp_info() on the s390 architecture. Although libbpf_netlink_open() always returns a negative number when it does not set *nl_pid, the compiler does not determine this and thus believes the variable might be used uninitialized. Assuage gcc's fears by explicitly initializing nl_pid. Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1807781 Signed-off-by: Jeremy Cline Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200404051430.698058-1-jcline@redhat.com Signed-off-by: Sasha Levin --- tools/lib/bpf/netlink.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/lib/bpf/netlink.c b/tools/lib/bpf/netlink.c index ce3ec81b71c01..88416be2bf994 100644 --- a/tools/lib/bpf/netlink.c +++ b/tools/lib/bpf/netlink.c @@ -137,7 +137,7 @@ int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags) struct ifinfomsg ifinfo; char attrbuf[64]; } req; - __u32 nl_pid; + __u32 nl_pid = 0; sock = libbpf_netlink_open(&nl_pid); if (sock < 0) @@ -254,7 +254,7 @@ int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags) { struct xdp_id_md xdp_id = {}; int sock, ret; - __u32 nl_pid; + __u32 nl_pid = 0; __u32 mask; if (flags & ~XDP_FLAGS_MASK)