vxlan: Possible regression in vxlan_rcv()

["Fabian Frédérick" <fabf@skynet.be>]

Hi,

    Last year I sent the following

2ae2904b5bac
("vxlan: don't collect metadata if remote checksum is wrong")


thinking it was an optimization and noticed it was managed in that order 
before patch

f14ecebb3a4e
("vxlan: clean up extension handling on rx")


    I was not able to create some script to test that code and had no 
feedback on it but lately, looking at it again I noticed that metadata 
sequence (if (vxlan_collect_metadata(vs))) was updating skb in 
skb_dst_set(skb, (struct dst_entry *)tun_dst); which was not the case 
during the clean up above.

   Can someone tell me if the update is really ok or how I could check 
that code ?
if VXLAN_F_REMCSUM_RX involves metadata checking I can ask to remove the 
patch.

Best regards,
Fabian