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3da812d860
gre_hlen already accounts for sizeof(struct ipv6_hdr) + gre header,
so initialize max_headroom to zero. Otherwise the
if (encap_limit >= 0) {
max_headroom += 8;
mtu -= 8;
}
increments an uninitialized variable before max_headroom was reset.
Found with coverity: 728539
Cc: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>