From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A98FF1F668A; Tue, 21 Jan 2025 18:10:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737483005; cv=none; b=ZI+zsNlHhj7qr4i+mb/nLIelLb99oXkdrmmqSq2vpJ7DxAVX7J8nXKuGHBzJSRZPgv+K+WOAMEQDq2RqpfirYZMvJCZ+c9zuqAPR//IhLst+4ghiNpOXgg/M36k8vf7EtONC0uJn46w0qrREuOopkpCb8jK4dBOKYMzh5xBLpAo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737483005; c=relaxed/simple; bh=o1u39yU1xJmNb1A975VBI+M1ALbZ0gJe3rQmWZKe3zM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Pq+MDBbPw8T8sEAeSFHL41IA4wa5oMKy9ZJshTI5NuS0vKKj9VFsHVN6ab6HyEkJqplsTnD4aedUuR/C2MINroF13Yt0zsJAVnQ5Rz/10GRZOjnVhDSlY4vdp06fh97J/pVW+c7STcG3e1hfujUMMiq5hLzmjnK3D4IiWFhiC1I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cY5nVI5A; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="cY5nVI5A" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 26081C4CEE1; Tue, 21 Jan 2025 18:10:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1737483005; bh=o1u39yU1xJmNb1A975VBI+M1ALbZ0gJe3rQmWZKe3zM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cY5nVI5AOTVvbohvXO3/au16lZjBQfAMF3Z4KGt9ccOUfmZHzikEjP5w7UHmtL8oi S2F5pz9NFZcpOBacXTT1GVCb3XcCHiNoLR9OBPuhSQ+2e7mGttvt7Fta7D4HtztkrX e/bVmn1LlR9/go1CaCd8URD69nyXfOIBm0QVR2C8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xiao Liang , Kuniyuki Iwashima , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 084/127] gtp: Use for_each_netdev_rcu() in gtp_genl_dump_pdp(). Date: Tue, 21 Jan 2025 18:52:36 +0100 Message-ID: <20250121174532.893149210@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250121174529.674452028@linuxfoundation.org> References: <20250121174529.674452028@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kuniyuki Iwashima [ Upstream commit 46841c7053e6d25fb33e0534ef023833bf03e382 ] gtp_newlink() links the gtp device to a list in dev_net(dev). However, even after the gtp device is moved to another netns, it stays on the list but should be invisible. Let's use for_each_netdev_rcu() for netdev traversal in gtp_genl_dump_pdp(). Note that gtp_dev_list is no longer used under RCU, so list helpers are converted to the non-RCU variant. Fixes: 459aa660eb1d ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)") Reported-by: Xiao Liang Closes: https://lore.kernel.org/netdev/CABAhCOQdBL6h9M2C+kd+bGivRJ9Q72JUxW+-gur0nub_=PmFPA@mail.gmail.com/ Signed-off-by: Kuniyuki Iwashima Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/gtp.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c index 67dcdd471a659..e4d29c22a0a79 100644 --- a/drivers/net/gtp.c +++ b/drivers/net/gtp.c @@ -698,7 +698,7 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev, } gn = net_generic(dev_net(dev), gtp_net_id); - list_add_rcu(>p->list, &gn->gtp_dev_list); + list_add(>p->list, &gn->gtp_dev_list); dev->priv_destructor = gtp_destructor; netdev_dbg(dev, "registered new GTP interface\n"); @@ -724,7 +724,7 @@ static void gtp_dellink(struct net_device *dev, struct list_head *head) hlist_for_each_entry_safe(pctx, next, >p->tid_hash[i], hlist_tid) pdp_context_delete(pctx); - list_del_rcu(>p->list); + list_del(>p->list); unregister_netdevice_queue(dev, head); } @@ -1305,16 +1305,19 @@ static int gtp_genl_dump_pdp(struct sk_buff *skb, struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; int i, j, bucket = cb->args[0], skip = cb->args[1]; struct net *net = sock_net(skb->sk); + struct net_device *dev; struct pdp_ctx *pctx; - struct gtp_net *gn; - - gn = net_generic(net, gtp_net_id); if (cb->args[4]) return 0; rcu_read_lock(); - list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { + for_each_netdev_rcu(net, dev) { + if (dev->rtnl_link_ops != >p_link_ops) + continue; + + gtp = netdev_priv(dev); + if (last_gtp && last_gtp != gtp) continue; else @@ -1410,9 +1413,9 @@ static void __net_exit gtp_net_exit_batch_rtnl(struct list_head *net_list, list_for_each_entry(net, net_list, exit_list) { struct gtp_net *gn = net_generic(net, gtp_net_id); - struct gtp_dev *gtp; + struct gtp_dev *gtp, *gtp_next; - list_for_each_entry(gtp, &gn->gtp_dev_list, list) + list_for_each_entry_safe(gtp, gtp_next, &gn->gtp_dev_list, list) gtp_dellink(gtp->dev, dev_to_kill); } } -- 2.39.5