[PATCH net-next 4/5] vxlan: fix too large pskb_may_pull with remote checksum

[Jiri Benc]

The vxlan header is pulled at this point, don't include it again in the
calculation.

Signed-off-by: Jiri Benc <jb...@redhat.com>
---
 drivers/net/vxlan.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 029e0e5b0b2b..81a7c1a829b9 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1142,7 +1142,7 @@ static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
                          struct sk_buff *skb, u32 vxflags)
 {
-       size_t start, offset, plen;
+       size_t start, offset;
 
        if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
                goto out;
@@ -1150,9 +1150,7 @@ static bool vxlan_remcsum(struct vxlanhdr *unparsed,
        start = vxlan_rco_start(unparsed->vx_vni);
        offset = start + vxlan_rco_offset(unparsed->vx_vni);
 
-       plen = sizeof(struct vxlanhdr) + offset + sizeof(u16);
-
-       if (!pskb_may_pull(skb, plen))
+       if (!pskb_may_pull(skb, offset + sizeof(u16)))
                return false;
 
        skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
-- 
1.8.3.1