diff options
| author | Evgeny Kravtsunov <emkravts@openvz.org> | 2007-04-17 12:31:24 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-17 14:16:00 -0700 |
| commit | 19bb3506e27096eea5f7b71b89621ad1203ed318 (patch) | |
| tree | f3385d69595ab50fffbc314b281864ef99f2071b | |
| parent | 0304ff8a2d5f57defb011c7f261b4c1b3eff96d1 (diff) | |
| download | lwn-19bb3506e27096eea5f7b71b89621ad1203ed318.tar.gz lwn-19bb3506e27096eea5f7b71b89621ad1203ed318.zip | |
[BRIDGE]: Unaligned access when comparing ethernet addresses
compare_ether_addr() implicitly requires that the addresses
passed are 2-bytes aligned in memory.
This is not true for br_stp_change_bridge_id() and
br_stp_recalculate_bridge_id() in which one of the addresses
is unsigned char *, and thus may not be 2-bytes aligned.
Signed-off-by: Evgeny Kravtsunov <emkravts@openvz.org>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: Pavel Emelianov <xemul@openvz.org>
| -rw-r--r-- | net/bridge/br_stp_if.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c index 58d13f2bd121..a285897a2fb4 100644 --- a/net/bridge/br_stp_if.c +++ b/net/bridge/br_stp_if.c @@ -126,7 +126,9 @@ void br_stp_disable_port(struct net_bridge_port *p) /* called under bridge lock */ void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) { - unsigned char oldaddr[6]; + /* should be aligned on 2 bytes for compare_ether_addr() */ + unsigned short oldaddr_aligned[ETH_ALEN >> 1]; + unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; struct net_bridge_port *p; int wasroot; @@ -151,11 +153,14 @@ void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) br_become_root_bridge(br); } -static const unsigned char br_mac_zero[6]; +/* should be aligned on 2 bytes for compare_ether_addr() */ +static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; /* called under bridge lock */ void br_stp_recalculate_bridge_id(struct net_bridge *br) { + const unsigned char *br_mac_zero = + (const unsigned char *)br_mac_zero_aligned; const unsigned char *addr = br_mac_zero; struct net_bridge_port *p; |