ipv6: gre: correct calculation of max_headroom

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 6b26e9feafb9..7bb5446b9d73 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -618,7 +618,7 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
         struct ip6_tnl *tunnel = netdev_priv(dev);
         struct net_device *tdev;    /* Device to other host */
         struct ipv6hdr  *ipv6h;     /* Our new IP header */
-        unsigned int max_headroom;  /* The extra header space needed */
+        unsigned int max_headroom = 0; /* The extra header space needed */
         int    gre_hlen;
         struct ipv6_tel_txoption opt;
         int    mtu;
@@ -693,7 +693,7 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
 
         skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
 
-        max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
+        max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
 
         if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
             (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {