Commit 01972df4 authored by Ben Hutchings's avatar Ben Hutchings

ipv6: xfrm: Handle errors reported by xfrm6_find_1stfragopt()

commit 6e80ac5c upstream.

xfrm6_find_1stfragopt() may now return an error code and we must
not treat it as a length.

Fixes: 2423496a ("ipv6: Prevent overrun when parsing v6 header options")
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
Acked-by: default avatarCraig Gallek <kraig@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 77f26255
......@@ -47,6 +47,8 @@ static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
iph = ipv6_hdr(skb);
hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
if (hdr_len < 0)
return hdr_len;
skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
skb_set_network_header(skb, -x->props.header_len);
skb->transport_header = skb->network_header + hdr_len;
......
......@@ -28,6 +28,8 @@ static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
iph = ipv6_hdr(skb);
hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
if (hdr_len < 0)
return hdr_len;
skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
skb_set_network_header(skb, -x->props.header_len);
skb->transport_header = skb->network_header + hdr_len;
......
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