[PATCH] net: i40e: prevent access to uninitilized variables in i40e_tx_enable_csum()

[Vasily Averin]

Patch makes safe an access to 'oiph' and 'oudph' variables
if they was not initilized.

Signed-off-by: Vasily Averin <v...@virtuozzo.com>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c 
b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 47bd8b3..779f77e 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2363,7 +2363,8 @@ static void i40e_tx_enable_csum(struct sk_buff *skb, u32 
*tx_flags,
                }
                if ((tx_ring->flags & I40E_TXR_FLAGS_OUTER_UDP_CSUM) &&
                    (l4_tunnel == I40E_TXD_CTX_UDP_TUNNELING)        &&
-                   (*cd_tunneling & I40E_TXD_CTX_QW0_EXT_IP_MASK)) {
+                   (*cd_tunneling & I40E_TXD_CTX_QW0_EXT_IP_MASK)   &&
+                   oudph && oiph) {
                        oudph->check = ~csum_tcpudp_magic(oiph->saddr,
                                        oiph->daddr,
                                        (skb->len - skb_transport_offset(skb)),
-- 
1.9.1