bnxt_en: Fix array overrun in bnxt_fill_l2_rewrite_fields().

Fix the array overrun while keeping the eth_addr and eth_addr_mask
pointers as u16 to avoid unaligned u16 access.  These were overlooked
when modifying the code to use u16 pointer for proper alignment.

Fixes: 90f90624 ("bnxt_en: Add support for L2 rewrite")
Reported-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c

@@ -166,8 +166,8 @@ bnxt_fill_l2_rewrite_fields(struct bnxt_tc_actions *actions,
 			actions->l2_rewrite_dmac[j] = cpu_to_be16(*(p + j));
 	}
 
-	if (!is_wildcard(&eth_addr_mask[ETH_ALEN], ETH_ALEN)) {
-		if (!is_exactmatch(&eth_addr_mask[ETH_ALEN], ETH_ALEN))
+	if (!is_wildcard(&eth_addr_mask[ETH_ALEN / 2], ETH_ALEN)) {
+		if (!is_exactmatch(&eth_addr_mask[ETH_ALEN / 2], ETH_ALEN))
 			return -EINVAL;
 		/* FW expects smac to be in u16 array format */
 		p = &eth_addr[ETH_ALEN / 2];

drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h

@@ -64,9 +64,9 @@ struct bnxt_tc_tunnel_key {
 
 #define bnxt_eth_addr_key_mask_invalid(eth_addr, eth_addr_mask)		\
 	((is_wildcard(&(eth_addr)[0], ETH_ALEN) &&			\
-	 is_wildcard(&(eth_addr)[ETH_ALEN], ETH_ALEN)) ||		\
+	 is_wildcard(&(eth_addr)[ETH_ALEN / 2], ETH_ALEN)) ||		\
 	(is_wildcard(&(eth_addr_mask)[0], ETH_ALEN) &&			\
-	 is_wildcard(&(eth_addr_mask)[ETH_ALEN], ETH_ALEN)))
+	 is_wildcard(&(eth_addr_mask)[ETH_ALEN / 2], ETH_ALEN)))
 
 struct bnxt_tc_actions {
 	u32				flags;