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net: bridge: enfore alignment for ethernet address 

[ Upstream commit db7202dec92e6caa2706c21d6fc359af318bde2e ]

The eth_addr member is passed to ether_addr functions that require
2-byte alignment, therefore the member must be properly aligned
to avoid unaligned accesses.

The problem is in place since the initial merge of multicast to unicast:
commit 6db6f0eae6 bridge: multicast to unicast

Fixes: 6db6f0eae6 ("bridge: multicast to unicast")
Cc: Roopa Prabhu <roopa@cumulusnetworks.com>
Cc: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Felix Fietkau <nbd@nbd.name>
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Martitz <t.martitz@avm.de>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Martitz 2020-06-25 14:26:03 +02:00 committed by Sasha Levin
parent 57a976e676
commit f32325b100
1 changed files with 1 additions and 1 deletions
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2
net/bridge/br_private.h
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@ -208,8 +208,8 @@ struct net_bridge_port_group {
struct rcu_head rcu;
struct timer_list timer;
struct br_ip addr;
unsigned char eth_addr[ETH_ALEN] __aligned(2);
unsigned char flags;
unsigned char eth_addr[ETH_ALEN];
};
struct net_bridge_mdb_entry {