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_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, USER_AGENT_GIT autolearn=ham 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 98BBCC43460 for ; Mon, 12 Apr 2021 08:57:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 763C061365 for ; Mon, 12 Apr 2021 08:57:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237607AbhDLI5c (ORCPT ); Mon, 12 Apr 2021 04:57:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:45114 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238996AbhDLIzS (ORCPT ); Mon, 12 Apr 2021 04:55:18 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id ED8F76127A; Mon, 12 Apr 2021 08:54:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1618217675; bh=uxWhrvLsfG6a1PviJMUvVUC2CajiNLdihXsgRFpzYr8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zRKSqDTsIVIs/41uIAoldmB4FvOvRw4xnVNy5LrXabXZXUm6rlOpeN8xHCfNbHZjq vxVkaybEuRM/8GZdib8+Cwx9LZDK/YTWIN1VeLK7HsnO6RmjwcRlo5uOv65pa2yRrg 6Azxo0zp1iUQ/Lalj6nU16tc4N3g4cMW05Jr5prs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Aleksandr Loktionov , Arkadiusz Kubalewski , Dave Switzer , Tony Nguyen Subject: [PATCH 5.10 059/188] i40e: Fix sparse errors in i40e_txrx.c Date: Mon, 12 Apr 2021 10:39:33 +0200 Message-Id: <20210412084015.613735423@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210412084013.643370347@linuxfoundation.org> References: <20210412084013.643370347@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: stable@vger.kernel.org From: Arkadiusz Kubalewski commit 12738ac4754ec92a6a45bf3677d8da780a1412b3 upstream. Remove error handling through pointers. Instead use plain int to return value from i40e_run_xdp(...). Previously: - sparse errors were produced during compilation: i40e_txrx.c:2338 i40e_run_xdp() error: (-2147483647) too low for ERR_PTR i40e_txrx.c:2558 i40e_clean_rx_irq() error: 'skb' dereferencing possible ERR_PTR() - sk_buff* was used to return value, but it has never had valid pointer to sk_buff. Returned value was always int handled as a pointer. Fixes: 0c8493d90b6b ("i40e: add XDP support for pass and drop actions") Fixes: 2e6893123830 ("i40e: split XDP_TX tail and XDP_REDIRECT map flushing") Signed-off-by: Aleksandr Loktionov Signed-off-by: Arkadiusz Kubalewski Tested-by: Dave Switzer Signed-off-by: Tony Nguyen Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -2187,8 +2187,7 @@ int i40e_xmit_xdp_tx_ring(struct xdp_buf * @rx_ring: Rx ring being processed * @xdp: XDP buffer containing the frame **/ -static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring, - struct xdp_buff *xdp) +static int i40e_run_xdp(struct i40e_ring *rx_ring, struct xdp_buff *xdp) { int err, result = I40E_XDP_PASS; struct i40e_ring *xdp_ring; @@ -2227,7 +2226,7 @@ static struct sk_buff *i40e_run_xdp(stru } xdp_out: rcu_read_unlock(); - return ERR_PTR(-result); + return result; } /** @@ -2339,6 +2338,7 @@ static int i40e_clean_rx_irq(struct i40e unsigned int xdp_xmit = 0; bool failure = false; struct xdp_buff xdp; + int xdp_res = 0; #if (PAGE_SIZE < 8192) xdp.frame_sz = i40e_rx_frame_truesize(rx_ring, 0); @@ -2405,12 +2405,10 @@ static int i40e_clean_rx_irq(struct i40e /* At larger PAGE_SIZE, frame_sz depend on len size */ xdp.frame_sz = i40e_rx_frame_truesize(rx_ring, size); #endif - skb = i40e_run_xdp(rx_ring, &xdp); + xdp_res = i40e_run_xdp(rx_ring, &xdp); } - if (IS_ERR(skb)) { - unsigned int xdp_res = -PTR_ERR(skb); - + if (xdp_res) { if (xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR)) { xdp_xmit |= xdp_res; i40e_rx_buffer_flip(rx_ring, rx_buffer, size);