ACK: [SRU][G][PATCH 1/1] net: geneve: modify IP header check in geneve6_xmit_skb and geneve_xmit_skb

[Thadeu Lima de Souza Cascardo]

On Tue, Jun 15, 2021 at 04:17:36PM +0200, Kleber Sacilotto de Souza wrote:
> From: Phillip Potter <phil at philpotter.co.uk>
> 
> BugLink: https://bugs.launchpad.net/bugs/1931731
> 
> Modify the header size check in geneve6_xmit_skb and geneve_xmit_skb
> to use pskb_inet_may_pull rather than pskb_network_may_pull. This fixes
> two kernel selftest failures introduced by the commit introducing the
> checks:
> IPv4 over geneve6: PMTU exceptions
> IPv4 over geneve6: PMTU exceptions - nexthop objects
> 
> It does this by correctly accounting for the fact that IPv4 packets may
> transit over geneve IPv6 tunnels (and vice versa), and still fixes the
> uninit-value bug fixed by the original commit.
> 
> Reported-by: kernel test robot <oliver.sang at intel.com>
> Fixes: 6628ddfec758 ("net: geneve: check skb is large enough for IPv4/IPv6 header")
> Suggested-by: Sabrina Dubroca <sd at queasysnail.net>
> Signed-off-by: Phillip Potter <phil at philpotter.co.uk>
> Acked-by: Sabrina Dubroca <sd at queasysnail.net>
> Signed-off-by: David S. Miller <davem at davemloft.net>
> (cherry picked from commit d13f048dd40e8577260cd43faea8ec9b77520197)
> Signed-off-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>

Acked-by: Thadeu Lima de Souza Cascardo <cascardo at canonical.com>

> ---
>  drivers/net/geneve.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
> index c4beb7ce471a..40f30656a62a 100644
> --- a/drivers/net/geneve.c
> +++ b/drivers/net/geneve.c
> @@ -891,7 +891,7 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
>  	__be16 sport;
>  	int err;
>  
> -	if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
> +	if (!pskb_inet_may_pull(skb))
>  		return -EINVAL;
>  
>  	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
> @@ -957,7 +957,7 @@ static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
>  	__be16 sport;
>  	int err;
>  
> -	if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
> +	if (!pskb_inet_may_pull(skb))
>  		return -EINVAL;
>  
>  	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
> -- 
> 2.27.0
> 
> 
> -- 
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