[ETH1394]: Fix unaligned accesses.

Several u64 objects are derefernced in situations where the
pointer is not guarenteed to be aligned correctly.  Use
get_unaligned() as needed.

Thanks to Will Simoneau for lots of testing and debugging
help.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

diff --git a/drivers/ieee1394/eth1394.c b/drivers/ieee1394/eth1394.c
index 8a7b8fab62383670a600abfda49f6d718b971a5c..31e5cc49d61a01899cea3e6d5220809f2b889be7 100644 (file)
--- a/drivers/ieee1394/eth1394.c
+++ b/drivers/ieee1394/eth1394.c
@@ -64,6 +64,7 @@
 #include <linux/ethtool.h>
 #include <asm/uaccess.h>
 #include <asm/delay.h>
+#include <asm/unaligned.h>
 #include <net/arp.h>
 
 #include "config_roms.h"
@@ -491,7 +492,7 @@ static void ether1394_reset_priv (struct net_device *dev, int set_mtu)
        int i;
        struct eth1394_priv *priv = netdev_priv(dev);
        struct hpsb_host *host = priv->host;
-       u64 guid = *((u64*)&(host->csr.rom->bus_info_data[3]));
+       u64 guid = get_unaligned((u64*)&(host->csr.rom->bus_info_data[3]));
        u16 maxpayload = 1 << (host->csr.max_rec + 1);
        int max_speed = IEEE1394_SPEED_MAX;
 
@@ -514,8 +515,8 @@ static void ether1394_reset_priv (struct net_device *dev, int set_mtu)
                                      ETHER1394_GASP_OVERHEAD)));
 
                /* Set our hardware address while we're at it */
-               *(u64*)dev->dev_addr = guid;
-               *(u64*)dev->broadcast = ~0x0ULL;
+               memcpy(dev->dev_addr, &guid, sizeof(u64));
+               memset(dev->broadcast, 0xff, sizeof(u64));
        }
 
        spin_unlock_irqrestore (&priv->lock, flags);
@@ -894,6 +895,7 @@ static inline u16 ether1394_parse_encap(struct sk_buff *skb,
                u16 maxpayload;
                struct eth1394_node_ref *node;
                struct eth1394_node_info *node_info;
+               __be64 guid;
 
                /* Sanity check. MacOSX seems to be sending us 131 in this
                 * field (atleast on my Panther G5). Not sure why. */
@@ -902,8 +904,9 @@ static inline u16 ether1394_parse_encap(struct sk_buff *skb,
 
                maxpayload = min(eth1394_speedto_maxpayload[sspd], (u16)(1 << (max_rec + 1)));
 
+               guid = get_unaligned(&arp1394->s_uniq_id);
                node = eth1394_find_node_guid(&priv->ip_node_list,
-                                             be64_to_cpu(arp1394->s_uniq_id));
+                                             be64_to_cpu(guid));
                if (!node) {
                        return 0;
                }
@@ -931,10 +934,9 @@ static inline u16 ether1394_parse_encap(struct sk_buff *skb,
                arp_ptr += arp->ar_pln;         /* skip over sender IP addr */
 
                if (arp->ar_op == htons(ARPOP_REQUEST))
-                       /* just set ARP req target unique ID to 0 */
-                       *((u64*)arp_ptr) = 0;
+                       memset(arp_ptr, 0, sizeof(u64));
                else
-                       *((u64*)arp_ptr) = *((u64*)dev->dev_addr);
+                       memcpy(arp_ptr, dev->dev_addr, sizeof(u64));
        }
 
        /* Now add the ethernet header. */
@@ -1675,8 +1677,10 @@ static int ether1394_tx (struct sk_buff *skb, struct net_device *dev)
                if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
                        priv->bc_dgl++;
        } else {
+               __be64 guid = get_unaligned((u64 *)eth->h_dest);
+
                node = eth1394_find_node_guid(&priv->ip_node_list,
-                                             be64_to_cpu(*(u64*)eth->h_dest));
+                                             be64_to_cpu(guid));
                if (!node) {
                        ret = -EAGAIN;
                        goto fail;