From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: [PATCH net-next 2/2] net: reset transport header if it was not set before transmission Date: Fri, 15 Mar 2013 15:41:45 +0800 Message-ID: <1363333305-54398-2-git-send-email-jasowang@redhat.com> References: <1363333305-54398-1-git-send-email-jasowang@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: mst@redhat.com, Jason Wang , Eric Dumazet To: davem@davemloft.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:63849 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752426Ab3COHvC (ORCPT ); Fri, 15 Mar 2013 03:51:02 -0400 In-Reply-To: <1363333305-54398-1-git-send-email-jasowang@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: Some drivers depends on transport_header to do packet transmission, but= it was unset in some cases (one example is macvtap driver which build skbs fro= m userspace and generate CHECKSUM_NONE packets). The driver may crash in = those cases since the transport_header was not valid. The problem becomes mor= e obvious since commit fda55eca5a33f33ffcd4192c6b2d75179714a52c (net: introduce skb_transport_header_was_set()) since it initializes transport_header t= o ~0U. So before passing the skb to driver, this patch reset the transport_hea= der if it was not set to avoid such crash such as: hp-z800-04.qe.lab.eng.nay.redhat.com login: BUG: unable to handle kerne= l paging request at ffff8805166f760c IP: [] ixgbe_xmit_frame_ring+0x220/0x5e0 [ixgbe] PGD 1ece067 PUD 0 Oops: 0000 [#1] SMP Modules linked in: vhost_net tun nfsv3 nfs_acl nfsv4 auth_rpcgss nfs fs= cache lockd autofs4 sunrpc openvswitch ipv6 iTCO_wdt iTCO_vendor_support hp_w= mi sparse_keymap rfkill acpi_cpufreq freq_table mperf coretemp kvm_intel k= vm crc32c_intel ghash_clmulni_intel microcode serio_raw pcspkr sg lpc_ich = mfd_core tg3 snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc i7core_ed= ac edac_core ixgbe dca ptp pps_core mdio ext4(F) mbcache(F) jbd2(F) sd_mod= (F) crc_t10dif(F) sr_mod(F) cdrom(F) firewire_ohci(F) firewire_core(F) crc_= itu_t(F) aesni_intel(F) ablk_helper(F) cryptd(F) lrw(F) aes_x86_64(F) xts(F) gf1= 28mul(F) floppy(F) mptsas(F) mptscsih(F) mptbase(F) scsi_transport_sas(F) ahci(F= ) libahci(F) nouveau(F) ttm(F) drm_kms_helper(F) drm(F) i2c_algo_bit(F) i2c_core(F) mxm_wmi(F) video(F) wmi(F) dm_mirror(F) dm_region_hash(F) d= m_log(F) dm_mod(F) [last unloaded: tun] CPU 6 Pid: 17337, comm: vhost-17317 Tainted: GF=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3.9.0-rc1+ #7 Hewlett-Packard HP Z800 Workstation/0AECh RIP: 0010:[]=C2=A0 [] ixgbe_xmit_frame_ring+0x220/0x5e0 [ixgbe] RSP: 0018:ffff880222cddb18=C2=A0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff880416b4b000 RCX: ffff8805166f75ff RDX: 0000000000000008 RSI: ffff8804166f760e RDI: 0000000000000007 RBP: ffff880222cddb68 R08: 0000000000000008 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90009dce120 R13: ffff880416b4b300 R14: 0000000000000000 R15: ffff8804118f0800 =46S:=C2=A0 0000000000000000(0000) GS:ffff88042fc40000(0000) knlGS:0000= 000000000000 CS:=C2=A0 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff8805166f760c CR3: 000000041e98c000 CR4: 00000000000027e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process vhost-17317 (pid: 17337, threadinfo ffff880222cdc000, task ffff8802211d4040) Stack: =C2=A000000000ffffffff 0000000000000180 ffff880222cddbb7 00000000000001= 80 =C2=A0ffff880222cddb48 ffff88040d5dd1c0 ffff8804118f0000 00000000000000= 36 =C2=A0ffff8804118f0000 ffff8804165d7a9c ffff880222cddb88 ffffffffa035a9= d3 Call Trace: =C2=A0[] ixgbe_xmit_frame+0x43/0x90 [ixgbe] =C2=A0[] dev_hard_start_xmit+0x12a/0x570 =C2=A0[] sch_direct_xmit+0xfa/0x1d0 =C2=A0[] dev_queue_xmit+0x198/0x4c0 =C2=A0[] macvlan_start_xmit+0x6a/0x170 =C2=A0[] macvtap_get_user+0x404/0x4e0 =C2=A0[] macvtap_sendmsg+0x2b/0x30 =C2=A0[] handle_tx+0x34a/0x680 [vhost_net] =C2=A0[] handle_tx_kick+0x15/0x20 [vhost_net] =C2=A0[] vhost_worker+0x10c/0x1c0 [vhost_net] =C2=A0[] ? vhost_attach_cgroups_work+0x30/0x30 [vhost= _net] =C2=A0[] ? vhost_attach_cgroups_work+0x30/0x30 [vhost= _net] =C2=A0[] kthread+0xce/0xe0 =C2=A0[] ? kthread_freezable_should_stop+0x70/0x70 =C2=A0[] ret_from_fork+0x7c/0xb0 =C2=A0[] ? kthread_freezable_should_stop+0x70/0x70 Code: 34 31 0f 84 d3 01 00 00 66 83 fa 08 0f 85 b9 00 00 00 80 7e 09 06= 0f 85 af 00 00 00 8b 80 cc 00 00 00 48 01 c1 0f 84 a0 00 00 00 <0f> b6 41 0d a8 = 01 0f 85 94 00 00 00 a8 02 75 0a 41 3a 7d 5c 0f RIP=C2=A0 [] ixgbe_xmit_frame_ring+0x220/0x5e0 [ixgbe= ] =C2=A0RSP CR2: ffff8805166f760c Cc: Eric Dumazet Signed-off-by: Jason Wang --- net/core/dev.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 480114d..db315a1 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2525,6 +2525,9 @@ int dev_hard_start_xmit(struct sk_buff *skb, stru= ct net_device *dev, } } =20 + if (!skb_transport_header_was_set(skb)) + skb_reset_transport_header(skb); + if (!list_empty(&ptype_all)) dev_queue_xmit_nit(skb, dev); =20 --=20 1.7.1