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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, "Dave Taht" <dave.taht@gmail.com>,
	"Eric Dumazet" <edumazet@google.com>,
	"Toke Høiland-Jørgensen" <toke@toke.dk>,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.9 19/44] gso_segment: Reset skb->mac_len after modifying network header
Date: Thu, 27 Sep 2018 11:04:08 +0200	[thread overview]
Message-ID: <20180927090120.565699406@linuxfoundation.org> (raw)
In-Reply-To: <20180927090117.997362691@linuxfoundation.org>

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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Toke Høiland-Jørgensen" <toke@toke.dk>

[ Upstream commit c56cae23c6b167acc68043c683c4573b80cbcc2c ]

When splitting a GSO segment that consists of encapsulated packets, the
skb->mac_len of the segments can end up being set wrong, causing packet
drops in particular when using act_mirred and ifb interfaces in
combination with a qdisc that splits GSO packets.

This happens because at the time skb_segment() is called, network_header
will point to the inner header, throwing off the calculation in
skb_reset_mac_len(). The network_header is subsequently adjust by the
outer IP gso_segment handlers, but they don't set the mac_len.

Fix this by adding skb_reset_mac_len() calls to both the IPv4 and IPv6
gso_segment handlers, after they modify the network_header.

Many thanks to Eric Dumazet for his help in identifying the cause of
the bug.

Acked-by: Dave Taht <dave.taht@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/af_inet.c     |    1 +
 net/ipv6/ip6_offload.c |    1 +
 2 files changed, 2 insertions(+)

--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1277,6 +1277,7 @@ struct sk_buff *inet_gso_segment(struct
 		if (encap)
 			skb_reset_inner_headers(skb);
 		skb->network_header = (u8 *)iph - skb->head;
+		skb_reset_mac_len(skb);
 	} while ((skb = skb->next));
 
 out:
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -113,6 +113,7 @@ static struct sk_buff *ipv6_gso_segment(
 			payload_len = skb->len - nhoff - sizeof(*ipv6h);
 		ipv6h->payload_len = htons(payload_len);
 		skb->network_header = (u8 *)ipv6h - skb->head;
+		skb_reset_mac_len(skb);
 
 		if (udpfrag) {
 			int err = ip6_find_1stfragopt(skb, &prevhdr);



  parent reply	other threads:[~2018-09-27  9:26 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-27  9:03 [PATCH 4.9 00/44] 4.9.130-stable review Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 01/44] NFC: Fix possible memory corruption when handling SHDLC I-Frame commands Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 02/44] NFC: Fix the number of pipes Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 03/44] ASoC: cs4265: fix MMTLR Data switch control Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 04/44] ALSA: bebob: fix memory leak for M-Audio FW1814 and ProjectMix I/O at error path Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 05/44] ALSA: bebob: use address returned by kmalloc() instead of kernel stack for streaming DMA mapping Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 06/44] ALSA: emu10k1: fix possible info leak to userspace on SNDRV_EMU10K1_IOCTL_INFO Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 07/44] ALSA: firewire-digi00x: fix memory leak of private data Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 08/44] ALSA: firewire-tascam: " Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 09/44] ALSA: fireworks: fix memory leak of response buffer at error path Greg Kroah-Hartman
2018-09-27  9:03 ` [PATCH 4.9 10/44] ALSA: oxfw: fix memory leak for model-dependent data " Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 11/44] ALSA: oxfw: fix memory leak of discovered stream formats " Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 12/44] ALSA: oxfw: fix memory leak of private data Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 13/44] platform/x86: alienware-wmi: Correct a memory leak Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 14/44] xen/netfront: dont bug in case of too many frags Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 15/44] xen/x86/vpmu: Zero struct pt_regs before calling into sample handling code Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 16/44] Revert "PCI: Add ACS quirk for Intel 300 series" Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 17/44] ring-buffer: Allow for rescheduling when removing pages Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 18/44] mm: shmem.c: Correctly annotate new inodes for lockdep Greg Kroah-Hartman
2018-09-27  9:04 ` Greg Kroah-Hartman [this message]
2018-09-27  9:04 ` [PATCH 4.9 20/44] ipv6: fix possible use-after-free in ip6_xmit() Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 21/44] net/appletalk: fix minor pointer leak to userspace in SIOCFINDIPDDPRT Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 22/44] net: hp100: fix always-true check for link up state Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 23/44] udp4: fix IP_CMSG_CHECKSUM for connected sockets Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 24/44] neighbour: confirm neigh entries when ARP packet is received Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 25/44] scsi: target: iscsi: Use hex2bin instead of a re-implementation Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 26/44] ocfs2: fix ocfs2 read block panic Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 27/44] drm/nouveau/drm/nouveau: Fix bogus drm_kms_helper_poll_enable() placement Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 28/44] drm/nouveau/drm/nouveau: Use pm_runtime_get_noresume() in connector_detect() Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 29/44] drm/nouveau/drm/nouveau: Prevent handling ACPI HPD events too early Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 30/44] drm/vc4: Fix the "no scaling" case on multi-planar YUV formats Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 31/44] tty: vt_ioctl: fix potential Spectre v1 Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 32/44] ext4: check to make sure the rename(2)s destination is not freed Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 33/44] ext4: avoid divide by zero fault when deleting corrupted inline directories Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 34/44] ext4: recalucate superblock checksum after updating free blocks/inodes Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 35/44] ext4: fix online resizes handling of a too-small final block group Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 36/44] ext4: fix online resizing for bigalloc file systems with a 1k block size Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 37/44] ext4: dont mark mmp buffer head dirty Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 38/44] ext4: show test_dummy_encryption mount option in /proc/mounts Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 39/44] sched/fair: Fix vruntime_normalized() for remote non-migration wakeup Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 40/44] HID: sony: Update device ids Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 41/44] HID: sony: Support DS4 dongle Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 42/44] PCI: aardvark: Size bridges before resources allocation Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 43/44] vmw_balloon: include asm/io.h Greg Kroah-Hartman
2018-09-27  9:04 ` [PATCH 4.9 44/44] iw_cxgb4: only allow 1 flush on user qps Greg Kroah-Hartman
2018-09-27 18:59 ` [PATCH 4.9 00/44] 4.9.130-stable review Nathan Chancellor
2018-09-27 19:51 ` Rafael David Tinoco
2018-09-27 20:14 ` Shuah Khan
2018-09-27 21:58 ` Guenter Roeck

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