Commit 49688c84 authored by David S. Miller's avatar David S. Miller

[NETFILTER] arp_tables: Fix unaligned accesses.

There are two device string comparison loops in arp_packet_match().
The first one goes byte-by-byte but the second one tries to be
clever and cast the string to a long and compare by longs.

The device name strings in the arp table entries are not guarenteed
to be aligned enough to make this value, so just use byte-by-byte
for both cases.

Based upon a report by <drraid@gmail.com>.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 612f09e8
......@@ -166,13 +166,9 @@ static inline int arp_packet_match(const struct arphdr *arphdr,
return 0;
}
for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
unsigned long odev;
memcpy(&odev, outdev + i*sizeof(unsigned long),
sizeof(unsigned long));
ret |= (odev
^ ((const unsigned long *)arpinfo->outiface)[i])
& ((const unsigned long *)arpinfo->outiface_mask)[i];
for (i = 0, ret = 0; i < IFNAMSIZ; i++) {
ret |= (outdev[i] ^ arpinfo->outiface[i])
& arpinfo->outiface_mask[i];
}
if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) {
......
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