From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH] net: Fix oops from tcp_collapse() when using splice() Date: Tue, 30 Mar 2010 13:47:41 -0700 (PDT) Message-ID: <20100330.134741.203608594.davem@davemloft.net> References: <1269981913-18073-1-git-send-email-steve@digidescorp.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, kuznet@ms2.inr.ac.ru, pekkas@netcore.fi, jmorris@namei.org, yoshfuji@linux-ipv6.org, kaber@trash.net, linux-kernel@vger.kernel.org, monstr@monstr.eu, karl@hiramoto.org To: steve@digidescorp.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:58985 "EHLO sunset.davemloft.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756185Ab0C3Url (ORCPT ); Tue, 30 Mar 2010 16:47:41 -0400 In-Reply-To: <1269981913-18073-1-git-send-email-steve@digidescorp.com> Sender: netdev-owner@vger.kernel.org List-ID: From: "Steven J. Magnani" Date: Tue, 30 Mar 2010 15:45:13 -0500 > tcp_read_sock() can have a eat skbs without immediately advancing copied_seq. > This can cause a panic in tcp_collapse() if it is called as a result > of the recv_actor dropping the socket lock. > > A userspace program that splices data from a socket to either another > socket or to a file can trigger this bug. > > Signed-off-by: Steven J. Magnani Thanks for fixing this I'll look at your patch more closely right now.