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[PATCH 4.2.y-ckt 38/53] vlan: pull on __vlan_insert_tag error path and fix csum correction

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4.2.8-ckt11 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Daniel Borkmann <daniel@iogearbox.net>

[ Upstream commit 9241e2df4fbc648a92ea0752918e05c26255649e ]

When __vlan_insert_tag() fails from skb_vlan_push() path due to the
skb_cow_head(), we need to undo the __skb_push() in the error path
as well that was done earlier to move skb->data pointer to mac header.

Moreover, I noticed that when in the non-error path the __skb_pull()
is done and the original offset to mac header was non-zero, we fixup
from a wrong skb->data offset in the checksum complete processing.

So the skb_postpush_rcsum() really needs to be done before __skb_pull()
where skb->data still points to the mac header start and thus operates
under the same conditions as in __vlan_insert_tag().

Fixes: 93515d53b133 ("net: move vlan pop/push functions into common code")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 net/core/skbuff.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c412278..efcfd04 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4409,13 +4409,16 @@ int skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci)
 		__skb_push(skb, offset);
 		err = __vlan_insert_tag(skb, skb->vlan_proto,
 					skb_vlan_tag_get(skb));
-		if (err)
+		if (err) {
+			__skb_pull(skb, offset);
 			return err;
+		}
+
 		skb->protocol = skb->vlan_proto;
 		skb->mac_len += VLAN_HLEN;
-		__skb_pull(skb, offset);
 
 		skb_postpush_rcsum(skb, skb->data + (2 * ETH_ALEN), VLAN_HLEN);
+		__skb_pull(skb, offset);
 	}
 	__vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
 	return 0;
-- 
2.7.4

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[4.2.y-ckt stable] Linux 4.2.8-ckt11 stable review Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:00 +0200
  [PATCH 4.2.y-ckt 19/53] ALSA: usb-audio: Yet another Phoneix Audio device quirk Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:00 +0200
  [PATCH 4.2.y-ckt 32/53] net: fec: only clear a queue's work bit if the queue was emptied Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 27/53] macvtap: segmented packet is consumed Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 42/53] net_sched: update hierarchical backlog too Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 30/53] bridge: fix igmp / mld query parsing Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 24/53] workqueue: fix rebind bound workers warning Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 25/53] ocfs2: fix posix_acl_create deadlock Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 39/53] ipv4/fib: don't warn when primary address is missing if in_dev is dead Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 35/53] decnet: Do not build routes to devices without decnet private data. Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 46/53] net: fix infoleak in llc Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 37/53] net: use skb_postpush_rcsum instead of own implementations Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 34/53] net/route: enforce hoplimit max value Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 16/53] ALSA: hda - Fix subwoofer pin on ASUS N751 and N551 Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 31/53] net/mlx4_en: Fix endianness bug in IPV6 csum calculation Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 36/53] route: do not cache fib route info on local routes with oif Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 43/53] sch_htb: update backlog as well Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 14/53] drm/i915: Bail out of pipe config compute loop on LPT Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 15/53] ALSA: hda - Fix broken reconfig Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 05/53] ALSA: usb-audio: Quirk for yet another Phoenix Audio devices (v2) Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 28/53] regulator: axp20x: Fix axp22x ldo_io voltage ranges Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 38/53] vlan: pull on __vlan_insert_tag error path and fix csum correction Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 29/53] arm64: bpf: jit JMP_JSET_{X,K} Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 17/53] vfs: add vfs_select_inode() helper Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 41/53] net_sched: introduce qdisc_replace() helper Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 18/53] vfs: rename: check backing inode being equal Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 12/53] ALSA: hda - Fix white noise on Asus UX501VW headset Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 08/53] crypto: hash - Fix page length clamping in hash walk Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 02/53] Revert "usb: hub: do not clear BOS field during reset device" Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 07/53] drm/i915/bdw: Add missing delay during L3 SQC credit programming Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 10/53] drm/radeon: fix PLL sharing on DCE6.1 (v2) Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 04/53] regmap: spmi: Fix regmap_spmi_ext_read in multi-byte case Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 13/53] Input: max8997-haptic - fix NULL pointer dereference Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 11/53] get_rock_ridge_filename(): handle malformed NM entries Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 03/53] regulator: s2mps11: Fix invalid selector mask and voltages for buck9 Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 09/53] drm/radeon: fix DP link training issue with second 4K monitor Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200

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