Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755172AbbL3Wal (ORCPT ); Wed, 30 Dec 2015 17:30:41 -0500 Received: from mail-yk0-f171.google.com ([209.85.160.171]:34751 "EHLO mail-yk0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750904AbbL3Wag (ORCPT ); Wed, 30 Dec 2015 17:30:36 -0500 MIME-Version: 1.0 In-Reply-To: References: <1451416224-15871-1-git-send-email-jacob@teenage.engineering> <87y4cdyrbn.fsf@doppelsaurus.mobileactivedefense.com> <20151229.150843.2021692616139434395.davem@davemloft.net> Date: Wed, 30 Dec 2015 14:30:35 -0800 Message-ID: Subject: Re: [PATCH] net: Fix potential NULL pointer dereference in __skb_try_recv_datagram From: Cong Wang To: Jacob Siverskog Cc: Eric Dumazet , David Miller , Rainer Weikusat , netdev , Herbert Xu , Konstantin Khlebnikov , Al Viro , LKML Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 886 Lines: 22 On Wed, Dec 30, 2015 at 6:30 AM, Jacob Siverskog wrote: > On Wed, Dec 30, 2015 at 2:26 PM, Eric Dumazet wrote: >> How often can you trigger this bug ? > > Ok. I don't have a good repro to trigger it unfortunately, I've seen it just a > few times when bringing up/down network interfaces. Does the trace > give any clue? > A little bit. You need to help people to narrow down the problem because there are too many places using skb->next and skb->prev. Since you mentioned it seems related to network interface flip, what network interfaces are you using? What's is your TC setup? Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/