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net: erspan: reload pointer after pskb_may_pull 

pskb_may_pull() can change skb->data, so we need to re-load pkt_md
and ershdr at the right place.

Fixes: 94d7d8f292 ("ip6_gre: add erspan v2 support")
Fixes: f551c91de2 ("net: erspan: introduce erspan v2 for ip_gre")
Signed-off-by: William Tu <u9012063@gmail.com>
Cc: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu 2017-12-15 14:27:44 -08:00 committed by David S. Miller
parent ae3e13373b
commit d91e8db5b6
2 changed files with 6 additions and 2 deletions
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4
net/ipv4/ip_gre.c
View File

@ -279,7 +279,6 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
* Use ERSPAN 10-bit session ID as key.
*/
tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK);
pkt_md = (struct erspan_metadata *)(ershdr + 1);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,
tpi->flags | TUNNEL_KEY,
iph->saddr, iph->daddr, tpi->key);
@ -289,6 +288,9 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
if (unlikely(!pskb_may_pull(skb, len)))
return PACKET_REJECT;
ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len);
pkt_md = (struct erspan_metadata *)(ershdr + 1);
if (__iptunnel_pull_header(skb,
len,
htons(ETH_P_TEB),

4
net/ipv6/ip6_gre.c
View File

@ -515,7 +515,6 @@ static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
ver = (ntohs(ershdr->ver_vlan) & VER_MASK) >> VER_OFFSET;
tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK);
pkt_md = (struct erspan_metadata *)(ershdr + 1);
tunnel = ip6gre_tunnel_lookup(skb->dev,
&ipv6h->saddr, &ipv6h->daddr, tpi->key,
@ -526,6 +525,9 @@ static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
if (unlikely(!pskb_may_pull(skb, len)))
return PACKET_REJECT;
ershdr = (struct erspan_base_hdr *)skb->data;
pkt_md = (struct erspan_metadata *)(ershdr + 1);
if (__iptunnel_pull_header(skb, len,
htons(ETH_P_TEB),
false, false) < 0)