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

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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>
This commit is contained in:
Sven Eckelmann
2012-11-04 17:11:45 +01:00
committed by Antonio Quartulli
parent 6f0a0986e3
commit 5b24657443
4 changed files with 22 additions and 19 deletions
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4
net/batman-adv/icmp_socket.c
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@@ -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)) {