ipv6: check return value of ipv6_skip_exthdr

ipv6: check return value of ipv6_skip_exthdr

[ Upstream commit c0a00ae184376ae0f9a032a90e638fe8e7f1489f ]

The offset value is used in pointer math on skb->data.
Since ipv6_skip_exthdr may return -1 the pointer to uh and th
may not point to the actual udp and tcp headers and potentially
overwrite other stuff. This is why I think this should be checked.

EDIT:  added {}'s, thanks Kees

Signed-off-by: Jordy Zomer <jordy@pwning.systems>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>