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seg6: fix srh pointer in get_srh() 

pskb_may_pull may change pointers in header. For this reason, it is
mandatory to reload any pointer that points into skb header.

Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrea Mayer 2019-11-16 16:05:52 +01:00 committed by David S. Miller
parent acb9bdc148
commit 7f91ed8c4f
1 changed files with 5 additions and 0 deletions
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5
net/ipv6/seg6_local.c
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@ -81,6 +81,11 @@ static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb)
if (!pskb_may_pull(skb, srhoff + len))
return NULL;
/* note that pskb_may_pull may change pointers in header;
* for this reason it is necessary to reload them when needed.
*/
srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
if (!seg6_validate_srh(srh, len))
return NULL;