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=-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=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 DE34AC2D0DB for ; Fri, 24 Jan 2020 11:15:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B08DA2075D for ; Fri, 24 Jan 2020 11:15:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579864516; bh=JbTHv1bjqueWQjmlgoqvwMnFVoVmYp0qaCRSP/2mFAQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JE+BrIOodZYIJAkLb2H3OHeyZORIp1Ok5C4Z0ZRAMzXK+Gvy5ygxBM2s0dsh2NIjd 20B91J2OV6amXgKP4wewhTvJj9urV0JmC9NAHraZiJ3XQR/xqk6CIrRZX7hFhYsh3H xpde9XzyuWoBlsfbQ3QvJ6V7519ootEXbUEn5vz8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390253AbgAXLPP (ORCPT ); Fri, 24 Jan 2020 06:15:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:51640 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731323AbgAXLPI (ORCPT ); Fri, 24 Jan 2020 06:15:08 -0500 Received: from localhost (ip-213-127-102-57.ip.prioritytelecom.net [213.127.102.57]) (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 3A07820708; Fri, 24 Jan 2020 11:15:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579864507; bh=JbTHv1bjqueWQjmlgoqvwMnFVoVmYp0qaCRSP/2mFAQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0lT4/+efz2t8V3TXYShc/lOEsIPSyxRnPPYgT7zAnHfTJybOjpSNUIhfQnL45xUBa gwaeIZSHaZtSX2n7CvnXwHonvSQcwYYG3q8ITdvCHnAo9JS9UkE5rJchVtkxsYDGLI 6brnuRJ8HZVFHDeX+l8YfPkYyk+9okxiAiOpom8g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nathan Chancellor , Jon Maloy , "David S. Miller" , Sasha Levin Subject: [PATCH 4.19 271/639] tipc: tipc clang warning Date: Fri, 24 Jan 2020 10:27:21 +0100 Message-Id: <20200124093120.651508263@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124093047.008739095@linuxfoundation.org> References: <20200124093047.008739095@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jon Maloy [ Upstream commit 737889efe9713a0f20a75fd0de952841d9275e6b ] When checking the code with clang -Wsometimes-uninitialized we get the following warning: if (!tipc_link_is_establishing(l)) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ net/tipc/node.c:847:46: note: uninitialized use occurs here tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr); net/tipc/node.c:831:2: note: remove the 'if' if its condition is always true if (!tipc_link_is_establishing(l)) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ net/tipc/node.c:821:31: note: initialize the variable 'maddr' to silence this warning struct tipc_media_addr *maddr; We fix this by initializing 'maddr' to NULL. For the matter of clarity, we also test if 'xmitq' is non-empty before we use it and 'maddr' further down in the function. It will never happen that 'xmitq' is non- empty at the same time as 'maddr' is NULL, so this is a sufficient test. Fixes: 598411d70f85 ("tipc: make resetting of links non-atomic") Reported-by: Nathan Chancellor Signed-off-by: Jon Maloy Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/tipc/node.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/net/tipc/node.c b/net/tipc/node.c index 32556f480a606..e67ffd1949272 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -810,10 +810,10 @@ static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id, static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete) { struct tipc_link_entry *le = &n->links[bearer_id]; + struct tipc_media_addr *maddr = NULL; struct tipc_link *l = le->link; - struct tipc_media_addr *maddr; - struct sk_buff_head xmitq; int old_bearer_id = bearer_id; + struct sk_buff_head xmitq; if (!l) return; @@ -835,7 +835,8 @@ static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete) tipc_node_write_unlock(n); if (delete) tipc_mon_remove_peer(n->net, n->addr, old_bearer_id); - tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr); + if (!skb_queue_empty(&xmitq)) + tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr); tipc_sk_rcv(n->net, &le->inputq); } -- 2.20.1