net: rpl: fix rpl header size calculation
authorAlexander Aring <aahringo@redhat.com>
Mon, 17 Apr 2023 13:00:52 +0000 (09:00 -0400)
committerDavid S. Miller <davem@davemloft.net>
Wed, 19 Apr 2023 08:04:16 +0000 (09:04 +0100)
commit4e006c7a6dac0ead4c1bf606000aa90a372fc253
tree2ea0dbf86b5cd042424497464945f3a819a0f0e8
parent6f4833383e8514ea796d094e05c24889b8997fde
net: rpl: fix rpl header size calculation

This patch fixes a missing 8 byte for the header size calculation. The
ipv6_rpl_srh_size() is used to check a skb_pull() on skb->data which
points to skb_transport_header(). Currently we only check on the
calculated addresses fields using CmprI and CmprE fields, see:

https://www.rfc-editor.org/rfc/rfc6554#section-3

there is however a missing 8 byte inside the calculation which stands
for the fields before the addresses field. Those 8 bytes are represented
by sizeof(struct ipv6_rpl_sr_hdr) expression.

Fixes: 8610c7c6e3bd ("net: ipv6: add support for rpl sr exthdr")
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Reported-by: maxpl0it <maxpl0it@protonmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv6/rpl.c