diff options
| author | Daniel Borkmann <daniel@iogearbox.net> | 2016-04-16 02:27:58 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-18 17:06:36 -0700 |
| commit | a66ce519a3e9aca63739da0d716555588df5cc48 (patch) | |
| tree | 87a99a4511fd56c5e09ce8a48cc15736d9b8a5ef /net/core/skbuff.c | |
| parent | 79fdabe8706bd240c083a848f64081a4bc46d7af (diff) | |
vlan: pull on __vlan_insert_tag error path and fix csum correction
[ 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/core/skbuff.c')
| -rw-r--r-- | net/core/skbuff.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 78abe110c7a5..9835d9a8a7a4 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4427,13 +4427,16 @@ 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; |