Re: [PATCH net] sctp: call gso_reset_checksum when computing checksum in sctp_gso_segment

[David Miller]

From: Xin Long <lucien.xin@xxxxxxxxx>
Date: Tue, 12 Feb 2019 18:47:30 +0800

> Jianlin reported a panic when running sctp gso over gre over vlan device:
 ...
> It was caused by SKB_GSO_CB(skb)->csum_start not set in sctp_gso_segment.
> sctp_gso_segment() calls skb_segment() with 'feature | NETIF_F_HW_CSUM',
> which causes SKB_GSO_CB(skb)->csum_start not to be set in skb_segment().
> 
> For TCP/UDP, when feature supports HW_CSUM, CHECKSUM_PARTIAL will be set
> and gso_reset_checksum will be called to set SKB_GSO_CB(skb)->csum_start.
> 
> So SCTP should do the same as TCP/UDP, to call gso_reset_checksum() when
> computing checksum in sctp_gso_segment.
> 
> Reported-by: Jianlin Shi <jishi@xxxxxxxxxx>
> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>

Applied and queued up for -stable, thanks.