batman-adv: Reserve extra bytes in skb for better alignment

The ethernet header is 14 bytes long. Therefore, the data after it is not 4
byte aligned and may cause problems on systems without unaligned data access.
Reserving NET_IP_ALIGN more byes can fix the misalignment of the ethernet
header.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index 5874c0e84846..87ca8095b011 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -177,13 +177,13 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
         if (len >= sizeof(struct batadv_icmp_packet_rr))
                 packet_len = sizeof(struct batadv_icmp_packet_rr);
 
-        skb = dev_alloc_skb(packet_len + ETH_HLEN);
+        skb = dev_alloc_skb(packet_len + ETH_HLEN + NET_IP_ALIGN);
         if (!skb) {
                 len = -ENOMEM;
                 goto out;
         }
 
-        skb_reserve(skb, ETH_HLEN);
+        skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
         icmp_packet = (struct batadv_icmp_packet_rr *)skb_put(skb, packet_len);
 
         if (copy_from_user(icmp_packet, buff, packet_len)) {