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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 0E28FC2D0DA for ; Fri, 27 Dec 2019 12:05:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D963120CC7 for ; Fri, 27 Dec 2019 12:05:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="c5xeiJNI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727002AbfL0MFn (ORCPT ); Fri, 27 Dec 2019 07:05:43 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:40734 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726354AbfL0MFn (ORCPT ); Fri, 27 Dec 2019 07:05:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1577448341; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Q5XXULvPBCdPqhDyApB0SLhznAFY7NUhBbt1TjCPMF0=; b=c5xeiJNIk2Xt1eNmXEZdOfEsrqPacHEpe1Vu6kIdLv3tb3QhaCwXi24YGCK8tYbkae6yF5 Z/0IWjD8g+APBNo2ukKakPERPHeeWVKrxY+cp7iANHexydspF2XOlUcEW/7gQw4PnFqJYI 6vEbxL3OroMAwY7CIjPyeGFqxDoW2sw= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-197-RK0DHe2VOkKagDPiSD7irA-1; Fri, 27 Dec 2019 07:05:40 -0500 X-MC-Unique: RK0DHe2VOkKagDPiSD7irA-1 Received: by mail-wr1-f72.google.com with SMTP id f15so8369420wrr.2 for ; Fri, 27 Dec 2019 04:05:40 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Q5XXULvPBCdPqhDyApB0SLhznAFY7NUhBbt1TjCPMF0=; b=RiO5MzH8KT3/KJuBhk24qNwBkD9FcBxu7G0hTblPlc5Ocf6lFsCGnYkpkpdv+dCCAK 9QQ+xk7hCB9mi5+Wny178MT1bCngqT/D1I1jcVVOcRtxkhLiLnNbSEM/dHt/mXIdpWRs 8O9BDE0K5xZyftTFEAMi3qJB9a3HG0PoQZMvY3bpl03E6qJ5hSPUn6vhLoWQDB8iXeiW s3okbJpXdaAs2BvlLZWECONMfVCoqsMVi4fXd2qthX9mWxoNl+yFJ7n+KiwZJ4JnFkIR /mftkn4TQYuXXzX9G7XqQmPr4Y5o/nqEPZB9Q9nPpsns4qrLFp97h1CWWkufuOHUH6un ywuQ== X-Gm-Message-State: APjAAAXTHvg3bXw2LhKqIeeSK19vcmlYPTw3dIRNa9LcBYy0XY6Ixpqg Z+D5+6G9qu5+38DdybJUzInAhpt/pSGETDASIKGsKC2uWacqf5QoIu1hSQIYUna4IyEx5gZQThP sVv9GYDWboyr8sj/OZIrJHWzk X-Received: by 2002:adf:f850:: with SMTP id d16mr51411904wrq.161.1577448339561; Fri, 27 Dec 2019 04:05:39 -0800 (PST) X-Google-Smtp-Source: APXvYqxIUH/iXdbActUcnfV2oV6Gg5J5xnzokN2jSRLSiWh+2/KOUFQxi7yrQhQWMqgwNXmx/uukAw== X-Received: by 2002:adf:f850:: with SMTP id d16mr51411867wrq.161.1577448339208; Fri, 27 Dec 2019 04:05:39 -0800 (PST) Received: from linux-2.home (2a01cb058918ce00dd1a5a4f9908f2d5.ipv6.abo.wanadoo.fr. [2a01:cb05:8918:ce00:dd1a:5a4f:9908:f2d5]) by smtp.gmail.com with ESMTPSA id k13sm33967659wrx.59.2019.12.27.04.05.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Dec 2019 04:05:38 -0800 (PST) Date: Fri, 27 Dec 2019 13:05:36 +0100 From: Guillaume Nault To: Xu Wang Cc: paulus@samba.org, davem@davemloft.net, linux-ppp@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] ppp: Remove redundant BUG_ON() check in ppp_pernet Message-ID: <20191227120536.GA32264@linux-2.home> References: <1577243224-1923-1-git-send-email-vulab@iscas.ac.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1577243224-1923-1-git-send-email-vulab@iscas.ac.cn> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 25, 2019 at 03:07:04AM +0000, Xu Wang wrote: > Passing NULL to ppp_pernet causes a crash via BUG_ON. > Dereferencing net in net_generic() also has the same effect. > This patch removes the redundant BUG_ON check on the same parameter. > > Signed-off-by: Xu Wang > --- > drivers/net/ppp/ppp_generic.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c > index 3bf8a8b..22cc2cb 100644 > --- a/drivers/net/ppp/ppp_generic.c > +++ b/drivers/net/ppp/ppp_generic.c > @@ -296,8 +296,6 @@ static struct class *ppp_class; > /* per net-namespace data */ > static inline struct ppp_net *ppp_pernet(struct net *net) > { > - BUG_ON(!net); > - > return net_generic(net, ppp_net_id); > } Acked-by: Guillaume Nault