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authorEvgeny Kravtsunov <emkravts@openvz.org>2007-04-17 12:31:24 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-17 14:16:00 -0700
commit19bb3506e27096eea5f7b71b89621ad1203ed318 (patch)
treef3385d69595ab50fffbc314b281864ef99f2071b /net/bridge/br_stp_if.c
parent0304ff8a2d5f57defb011c7f261b4c1b3eff96d1 (diff)
downloadlinux-2.6.34-ux500-19bb3506e27096eea5f7b71b89621ad1203ed318.tar.gz
[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>
Diffstat (limited to 'net/bridge/br_stp_if.c')
-rw-r--r--net/bridge/br_stp_if.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
index 58d13f2bd12..a285897a2fb 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;